{
  "manageEntity": {
    "action": "Save",
    "entityId": "728373",
    "entityType": "Track",
    "nonce": "0x5043692f287304d8c10dc95cb907014e1ac1c77e40317e42337d374e09914a3e",
    "signature": "0x006aa532b9fb57c46a6d9bbc9b1cda111e9dc8afb88ef2ed821580ae5dc49dd56124ba3cd6ea834b92fad7ad7da656099dd04e0cd053fbe7de34783bc87ead841c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}