{
  "manageEntity": {
    "action": "Save",
    "entityId": "1664865152",
    "entityType": "Track",
    "nonce": "0x0f857977ef49ff215bcaccace8966cb0431a416f96a0526d1ff2b70ecd43fd17",
    "signature": "0xc3fe03e71f7a1aaa32f6503104fe168f8b8fd802f9daf12a25b1bf496a6bc2b3763e3ac62f699acd2c78843ca8fb1dd6e469a00ef25a4d42f90c782e1aee20591b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}