{
  "manageEntity": {
    "action": "Save",
    "entityId": "50747216",
    "entityType": "Track",
    "nonce": "0x5af354b0bbe40a07e1593285ce223fd1599a1930eb1663d70522d837bc82ab7d",
    "signature": "0x557a91571dea4520ac928a6d0bac5fccbe812a18ba366d04261048c672cdec3632fa0b1e5ff9e80054dd99bdce1e279022a1deb683374aa94e083f049130946d1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}