{
  "manageEntity": {
    "action": "Save",
    "entityId": "135122782",
    "entityType": "Track",
    "nonce": "0xb9620dabc5236dd8ba939f484b6fb9abff97b83cb49e687dc28fd57a26128272",
    "signature": "0xcf71789839652cdd4912ac2e62e081bb4d9de2abf42caa0fbd926655780b93cd4f07fa7734fe8c8595e5689bb63e84d8732820281334096ea82e8a31d0aaf2df1b",
    "signer": "0xA213cA1de66B976a54B3975E7f61eabF3CF196A2",
    "userId": "353372364"
  }
}