{
  "manageEntity": {
    "action": "Save",
    "entityId": "215194875",
    "entityType": "Track",
    "nonce": "0x27e4618561a6c563caa88231d4de838f3cdb1f3a6dfe48e75a2a19f090fa08f1",
    "signature": "0xedd1fa6baa08d1fe416161571b2471bb4a202f5fac58a1d72d5cc21c7f5bcfa10a090e5052ae142f2c0e8e2c41f98e9b895b07bef19cb5d5618cd65c2df1c24a1b",
    "signer": "0x48997477d821e30d3Fa835d1Ee7809B3253Cb100",
    "userId": "75085"
  }
}