{
  "manageEntity": {
    "action": "Save",
    "entityId": "1899270096",
    "entityType": "Track",
    "nonce": "0x08f1515d14adb0dd8044907e0d34a72051e5100c05c9a1c257e59c234793c4ea",
    "signature": "0xea0caabe846ca89fd7c88a698033ad3bab9ecbcf83ce89d2b0c97c41a27e19982f9ba2d5c00d3f9b8f15e0dcda289c6779640e18a5e9eaf16c12dfaf51c1340a1b",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}