{
  "manageEntity": {
    "action": "Save",
    "entityId": "747752390",
    "entityType": "Track",
    "nonce": "0x7907941a6c86699c9ea2737b7438dbea955de9f222480273e27494064548bc77",
    "signature": "0x3e84ebf69ca43a262bff5f70d144ab8f311aaa2e3daed2b2ba49113d6e99188e482089fb0438f16a2d38daa87d8a91ff7cbbdce6905dd71dc1b2a452ecd60d611c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}