{
  "manageEntity": {
    "action": "Save",
    "entityId": "138629842",
    "entityType": "Track",
    "nonce": "0x28b715e0e113ab03f6f8ef72225fdeaa6ac2e0aea544a15c2031becfd3683f31",
    "signature": "0xcd172bccb104f221bbb1d395733c008f29111997709cd2bb0ecdbf0181e1db9e677a0a2083cd28a4d7cbf7c6f1f396ebe48d80e10be3f226d1f7afd5266b6a931b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}