{
  "manageEntity": {
    "action": "Save",
    "entityId": "375239",
    "entityType": "Track",
    "nonce": "0x026fac3866a5580d266d3c4ec07de45eba56f903158b25066793ca5140244ea5",
    "signature": "0x99c5cfeb061c7298c845378b728764302d0f7f7a186c5b7e931222e12982c46a7983acd2194ae9eeb17ded13d6111c2763279e0270f794cb2e7b4766aebcdbc01c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}