Marcos Marin, (born on September 12, 1967) is a Brazilian artist currently residing in Monaco. His artistic journey began as a virtuoso pianist in São Paulo. However, his passion for visual art led
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba30150e726386fa2889021e4367de6e8674a80073c908e7339f9b6aebd6bcfc. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/775355b3-4862-4ee9-91bb-bfb674740197.json and https://artists.proofprofile.net/proofs/artist/775355b3-4862-4ee9-91bb-bfb674740197.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Assassin's Creed 4: Black Flag (Sea Shanty Edition, Vol. 2) [Original Game Soundtrack]
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7369dccfcceafa66e32608be37193de175966b888df86b9833762809a3a336a5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA2BN1301260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3c21682e2e45eeb12300f3f25c7ac71d9d1936d13a5aa978c38313761ad241. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA2BN1301261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291475373d23760be5bd190be6916a1d92cec39486bd7d580bdbc6db0917babf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA2BN1301262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b30f0349373705c35407868746aacc50ba99b0b21118eb5ac8c1d4ab41342a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA2BN1301263.