{
  "manageEntity": {
    "action": "Save",
    "entityId": "377833095",
    "entityType": "Track",
    "nonce": "0xafe7020787c4828e692fd473ca1770bdf04cfd3793db9cb77841d97b9c3c1a79",
    "signature": "0x95baf0262d8a3106cacf429a39b24ef6b3f71f497ca7963d25304af7a856bcd1007a47e699e275e1946190d039f878445a5b9df7ba5bf6bc34fea65cf891f6e91c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}