{
  "manageEntity": {
    "action": "Save",
    "entityId": "1237252403",
    "entityType": "Track",
    "nonce": "0xa90764d129c16855efaf2aa348e527c085e045f891470388e0893e2972d4c442",
    "signature": "0x5fbcca4c7af102cbee3b1301b6a2d45b2b3abe0c0fe6bcaad1c196403bc9ffb92d2d5f2a55b11420451163783ce0538bd2ca6b1aedc8e1fe753931b8b03bd59c1c",
    "signer": "0x8e43fB50A1566F5659d08D01C166F68b14371ED5",
    "userId": "964637229"
  }
}