{
  "manageEntity": {
    "action": "Save",
    "entityId": "616164761",
    "entityType": "Track",
    "nonce": "0x103e426fbed5315941e034c7bf85f291dea9ea92657dbc49638c1795fb361081",
    "signature": "0xa9fb941686dee7a35380414c583c0083217519ab8dc02dda447ced9d713da1fe645def61081c1a4569dba088fbd2a39c72406e160fd75d029a5ebd5d792a396b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}