{
  "manageEntity": {
    "action": "Save",
    "entityId": "385008",
    "entityType": "Track",
    "nonce": "0xd45f6765e1f5540da8235e568ef6f979e2c3eb0f10cff9fcc0374c684ac29779",
    "signature": "0x5ecc1cfc8542d46e82fb23909d8d2a664b34fa26f0555feb0a5a0cab32db550a15dfbbd3c46cb3ad1e6c02af687618b36b5b866ff7aaba9cc73fb213f403f5801c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}