{
  "manageEntity": {
    "action": "Save",
    "entityId": "1920415786",
    "entityType": "Track",
    "nonce": "0x770137398dcdc0cf71a2cc4692e221d3aa9916800321040f2c97a9ca1cc5e9e3",
    "signature": "0x647d8f9bece01c70c49ba86148ccadc910d924f185d022d708130c1945fb4e2b1cf81bd1668c532c51ee38f17b61c7d11c84939017884ce2a964d749b907a92e1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}