{
  "manageEntity": {
    "action": "Save",
    "entityId": "391523",
    "entityType": "Track",
    "nonce": "0x6616e048431449a660f804377985a0c6fe0014edc1757f73ebb2f9326bc1bfaa",
    "signature": "0xf3e10e9fbb88b2353deaadf877148de8ef54e468812acc2759d99355d07b1ba97703df474ae8f45f7c5bbe206cbf62fea7b10c6eb2af3b0af63c34b9cedeb3a71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}