{
  "manageEntity": {
    "action": "Save",
    "entityId": "485753032",
    "entityType": "Track",
    "nonce": "0x90e42a430e58faf0f2be4a4d7ea2b44429cb4b26c1976d493315a8f552520e76",
    "signature": "0x705a76bc2336b06dd4d1b184c4b7cc131cffef7445cd03cb7fb106ef161e064409d49b500f733bf81c5b4b203f7ea60f63c5831e96504b3ec1f87ef2be4494ad1c",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}