{
  "manageEntity": {
    "action": "Save",
    "entityId": "371847184",
    "entityType": "Track",
    "nonce": "0x64bbd4fbe7a679c682a8dfc1353382e8a4b4647cb0dc29d62ecaeb252fc72cb3",
    "signature": "0xfef1208acd130dd3cd9cf23fbe9e2fa561bdad45dd69f94b78860a34b24219bb5dcbdd644ca45e4fdbd67dffc8bef4fe330b68b4ad1538b71197b4f049ed1af91c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}