{
  "manageEntity": {
    "action": "Save",
    "entityId": "671563544",
    "entityType": "Track",
    "nonce": "0x5311821a676a55944d42c413b6bd86f746a2eecd79286865d628abbe47106435",
    "signature": "0xe3adc4f1902436b0f9d93881c5566f63710c59856032354b5720f616d3de5a0e254d5e2dcd9cc51432e32ae9ec4aed94994b200a01cdb5b1686fbfe6270956971c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}