{
  "manageEntity": {
    "action": "Save",
    "entityId": "703072139",
    "entityType": "Track",
    "nonce": "0xec9569cc875f1138eb1a4b1f858d9f2e485d12e96abe0dd679010ee483fbf2b1",
    "signature": "0x9ee1b910e69c0c779d631e0b5f82a2603f0de9656330fbdef27de1240c9b7e1d5c6cd86e927da1bb3b0800c157535cdb559bf3b450ef166fb617e582893807071b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}