{
  "manageEntity": {
    "action": "Save",
    "entityId": "646229",
    "entityType": "Track",
    "nonce": "0xc3f8699e8cfe875067afaa96b1a7af4d97808fc80207beffcd8c4aef551a3b09",
    "signature": "0xb17e8a31bd1e0dcd826959cff2f088b295f209b9afa205d24c803aa58f5fbdc3198fee34b5c94917929c890c78519c59292ada94e3d856000a13e84a26ff2ba01b",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}