{
  "manageEntity": {
    "action": "Save",
    "entityId": "1663887783",
    "entityType": "Track",
    "nonce": "0x03f449ee36ac9d730af1a86222b903eb709c394a0ce7b1a5c8b0fd1fe7d6f762",
    "signature": "0xe068f551ac221a883871da687529c03eb8270bd984c983805decabf68d76c70c3ced82b9e26f5769bde9fa9f6e9c628cb04bd44eeb95168afe1335d802148c9b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}