{
  "manageEntity": {
    "action": "Save",
    "entityId": "591013279",
    "entityType": "Track",
    "nonce": "0x6e2e5c6440de7879dc400feb35cc48206c5ba206b53a383fac0017eead161efe",
    "signature": "0xc3d3aa9c4b5365f30f498f18c778ef2193e9102c98e0b8b88f619ff1945b20391f83d50842b699c21dc57d98b96fa2a7ed1d9f4fc826147e7243a6499d38cd641b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}