{
  "manageEntity": {
    "action": "Save",
    "entityId": "462404005",
    "entityType": "Track",
    "nonce": "0xb1ef4c676a86c09cab8bd7ffd96efdcbbc1dfb4af83687dd007d33f307e2fe55",
    "signature": "0x8642f33f6b062d2a00461568662d4193451cac7304f31e16b95149053a537045490cf6d252102a1701831ae25a6f50b3bae430da0bc1a470e110fb2e551527441c",
    "signer": "0xbf1f8021D15fDffe83FE44dA0b0c9CE22371359e",
    "userId": "276678878"
  }
}