{
  "manageEntity": {
    "action": "Save",
    "entityId": "520702464",
    "entityType": "Track",
    "nonce": "0xa8cbad1e5aec53316c33b125ba537e79e8d018b1f2415cac89f6422821da9f03",
    "signature": "0x5a86ae937206a79e502cddfee45924ec6eeb3247133809c4c5afa541c67d0d0830538af6d5d76448721b20222a6c5900d34c943dbcab96370ac03a2fcb5cd78d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}