{
  "manageEntity": {
    "action": "Save",
    "entityId": "471136247",
    "entityType": "Track",
    "nonce": "0x9f0b01afa29f0531f711e4ecd7c7be0a0020ea8bf73e55c707c629ef2244c10d",
    "signature": "0x713e7876a3f820ca7416f15ca3a99cbc5da13c076b5aceab293626b34db5cb4c5c83388322399de38b4c1f0ac59c16b6465ed6ab4e064ffc98f9f7cd6a4f2e3f1b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}