{
  "manageEntity": {
    "action": "Save",
    "entityId": "2146190041",
    "entityType": "Track",
    "nonce": "0x19e7175db1cc9d349c3a0e425c1c09542d97cc2feafa54a58a055ecca7902402",
    "signature": "0x847cb0d128f760a0b226a73c01a25b22bb5eebbe63ccc59b01485974dc708f7a072a1c517038b4a6ab05fe55ac55cc97479cd70081c406e602c48c9fb45bfe2e1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}