{
  "manageEntity": {
    "action": "Save",
    "entityId": "419420409",
    "entityType": "Track",
    "nonce": "0x70caf2ee09c901746ad17d2e5930864367f31ba19b179bb2da6aa747be0bf337",
    "signature": "0xa9fac946d76b07d470362eeff6428a862772f1e87e2b44fc04f4ba36cde883500c7d9f22975bb0db36a1a17092b117ea4b05a2f16e634c8a76c2251bfeb0ae4d1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}