{
  "manageEntity": {
    "action": "Save",
    "entityId": "1721470878",
    "entityType": "Track",
    "nonce": "0x809a74476c0b2ce3d29da8b266df4c0cd6bbeb387eac9b3361f4effbae58c649",
    "signature": "0x0dd7cde69631f7438d25606cbf23da5b467067d4e200fea331782a4852116ae65e5e971dedb33cd281598734f964cc67d754a398b9e228f43924f2d4b76d18ad1c",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}