{
  "manageEntity": {
    "action": "Save",
    "entityId": "1947574846",
    "entityType": "Track",
    "nonce": "0x7c55fa8499b24c8e4da9d962bbf083c4c5988b83eaf91b4158119ad0a0a9a67a",
    "signature": "0x9223ddd4bf38f7c2da054d0a64b9caadbf6a0c30bbf54c68994063a6ca0bcbee49b5e6ddf4f733b784a4e68d89ed8b322d0565dd78636044af7e12a352a1f8571c",
    "signer": "0x136A4e19270387bc21d7e58a9592D46864B0Ad57",
    "userId": "956002390"
  }
}