{
  "manageEntity": {
    "action": "Save",
    "entityId": "1513514947",
    "entityType": "Track",
    "nonce": "0x6c50e09cad5c298946072f8d27e6bca1b506fb0170e8a2e2543c633b6e21bd4f",
    "signature": "0xed75d24a727a1b66f812cba7790981052f0c6c0a59c16afb7bcb4022ef0ce62d3a9d26e4aec3255ce2f29be6d690652f51ae7c37040dc9619a7d6114c2b27c901c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}