{
  "manageEntity": {
    "action": "Save",
    "entityId": "121304412",
    "entityType": "Track",
    "nonce": "0x8b3bb6a1a8206627e7e1476365b1dfc5c5caf5290ae20bb91386660e838bf1c5",
    "signature": "0xfe0cc0fa9d49b4a971876867ee4dfbb767c85bc93b758c2bb1611799ca44fc275e2926cafdda425b9720d54771c53f252d0e4914c4571ebc6bb2c8ab8f930f091b",
    "signer": "0x947087BC1D20163ca37206017CA3896e803E296a",
    "userId": "931030763"
  }
}