{
  "manageEntity": {
    "action": "Save",
    "entityId": "1913686990",
    "entityType": "Track",
    "nonce": "0xe48a348b4bc5a7358de9de6a53cb47d5cac23fbd578a7dad9aa2788d2f65f7c7",
    "signature": "0x94ef577e0ed6017490e9ebc15f37e4bb9681f5746d539746ac816a4218db4eac046c40dad61030c0d8d978d68c3169fac1bc13aedfd02fe05ab640b12de2eb711b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}