{
  "manageEntity": {
    "action": "Save",
    "entityId": "306615",
    "entityType": "Track",
    "nonce": "0x5b733dad6a42f6536c2ab91224fdd804147975ae9440321f770d1f33f8d4fadb",
    "signature": "0x58e4ac0602924bade9ae716959c47509e0b63992716a6a1312c2c3730027871e2ec371daf86d525efa7f9e663b29e6d028c5ee7f12872e4e4e593dd0a0dc6c2e1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}