{
  "manageEntity": {
    "action": "Save",
    "entityId": "544770",
    "entityType": "Track",
    "nonce": "0x2de3fae9376117f2a491ef8c51158698dc6825620e81e4e7cc7a7ad6ee78252e",
    "signature": "0x1fc9b7055023ab186cbb7a6ffab58068d3fa67501aec644baa8cdcc7bffe0bef7c90494c1f9510676658712a626edab46b55f362cc40e3dcb8b81ef7092c8afd1b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}