Marta Santos
type: MusicGroup
description: Marta Florença Casimiro dos Santos (born 25 December 1988, Luanda) is an Angolan handball player. She plays for the club Petro de Luanda and on the Angolan national team. She competed for the Angolan
popularity: 14
followers: 40
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc18a9a517f8c490126aefb1a4fd4f895b8449ae77f801dfb62bf4fa54b04f902
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953803
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953803
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e6f8220e-37fd-443e-9f3a-f392619183b0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T15:41:00Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc18a9a517f8c490126aefb1a4fd4f895b8449ae77f801dfb62bf4fa54b04f902","name":"Marta Santos","registered_at":"2026-06-15T04:46:16Z","symbol":"NIM0686358","token_address":"0x98a0818db799e22379e3100e7589e734921c5aaf","type":"artist","uuid":"e6f8220e-37fd-443e-9f3a-f392619183b0"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18a9a517f8c490126aefb1a4fd4f895b8449ae77f801dfb62bf4fa54b04f902. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.json and https://artists.proofprofile.net/proofs/artist/e6f8220e-37fd-443e-9f3a-f392619183b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T15:41:00Z
  text: {"copyright_id":"0xc18a9a517f8c490126aefb1a4fd4f895b8449ae77f801dfb62bf4fa54b04f902","name":"Marta Santos","registered_at":"2026-06-15T04:46:16Z","symbol":"NIM0686358","token_address":"0x98a0818db799e22379e3100e7589e734921c5aaf","type":"artist","uuid":"e6f8220e-37fd-443e-9f3a-f392619183b0"}