{
  "manageEntity": {
    "action": "Save",
    "entityId": "2004750734",
    "entityType": "Track",
    "nonce": "0x8e2d9816c6c5c37ac0c50bd0a711cd9a76aca9eea6a07f9271fedf179284aeb4",
    "signature": "0x55cd295c4ed6474a4d2e712623fc809af6b412ff1bbf7ae85d52a1e7ab7ea07b0de1d5a71967421b1af6ddaeb65f811282df724bd1f49e7103ba85203fc98a6f1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}