{
  "manageEntity": {
    "action": "Save",
    "entityId": "438229090",
    "entityType": "Track",
    "nonce": "0x9e29c3bcf595854f037813d39c0321a6f184c21ec55cc865fa785e3b58526cbc",
    "signature": "0x30dec93fd76cf1beff1ada0076a4589450a3ccf3ee3379099afe6453546333307e72221552d2bc2b6721fc98612fa7c888e90f22363e9515bafe6d9f88d148311c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}