{
  "manageEntity": {
    "action": "Save",
    "entityId": "1990494978",
    "entityType": "Track",
    "nonce": "0x4c7f447ca16917faaf198602f7edaa62745f57030b3d859404d57085662078c8",
    "signature": "0x94af6190a0ca4f1a3b6e4df5fd4e10c715480f72a02ca57d3765ca778a6eed7349142800fe185597ef4d957d76e23e0899b3e708b017d82b2618a55cb6d399841c",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}