{
  "manageEntity": {
    "action": "Save",
    "entityId": "702644547",
    "entityType": "Track",
    "nonce": "0x7aafdb6de2faf7289a2665e5e6b83f82033220a22a2110357bab8722ca6c783e",
    "signature": "0x0c44464a6846b66fc5436d76713dafeb46f91492250ddf74ea258d2829a36cf9673076bea039d3bbf3ff1294c662737b5627e3c7338addbe985cf531bd3366ae1b",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}