{
  "manageEntity": {
    "action": "Save",
    "entityId": "903730794",
    "entityType": "Track",
    "nonce": "0xdaf6b1436491ab15ab329a5af5d0632ab27acfc21a874f08daedd05e9ef679f6",
    "signature": "0x2950bb711cc2dd7bef440329c9db47c90e9c72445baa258692ec5b59aebfec7e1a4d423357b874e6db7026aa3a4168dd5c36e5e98349521dc022cfccc27d04ff1b",
    "signer": "0x5E1b23614a9da638dba09e8aB2E9B76ed81c688f",
    "userId": "306948669"
  }
}