{
  "manageEntity": {
    "action": "Save",
    "entityId": "72887553",
    "entityType": "Track",
    "nonce": "0x5417d68257042d6e0b1120399c907fd2a372d5a8ff9e018d87f06718c0ad7fb3",
    "signature": "0x0f4b6821139fd3586269d8ad83ebe5f6f9f670e54b41fa5ea5f16dfe58172acd19ed9fc2b4380b288f9d41fbdedff9749bce7cb4857acf4b8d044e7c909247a71b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}