{
  "manageEntity": {
    "action": "Save",
    "entityId": "489141630",
    "entityType": "Track",
    "nonce": "0x416fdc9781df002d185a78eca35f68c77f5169243ebaee8af28eabf870bb5b3a",
    "signature": "0xd157467b414687bb9d0660a23e7e9a2863b6cd1c23d2a4a2673bf73d064f92430271f2eda1d3da4f963b4f7d284a5f753dff7d132b1d1b552c6bb9890b03d13e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}