Visa most commonly refers to: Travel visa, a document allowing entry to a foreign country Work visa (work permit), a document granting permission to work in a foreign country Visa Inc., a US multin
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 0x7f09139ace82fe90c688a73966a0a56ad5775fd890d69b57e8e2481fdedfc014. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f680ba1-0ba6-4572-9e12-f73a22d3778d.json and https://artists.proofprofile.net/proofs/artist/6f680ba1-0ba6-4572-9e12-f73a22d3778d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xa9d1603dcbd4d860624399bfc233d1bcd31c52417bb8289e4900956b8e065019. 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/GBBRQ9600266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506ef35d6a9ba6740ff94b299395312c0008bc9a1f72ccd1ad5d1dfbaa0528fe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBBRQ0500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb89f4a062d33389e76a2e5cdd8fa1ae0da731bf02aae26dde77df5bbb2f591. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:50:28Z), 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/GBBRQ0500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506ef35d6a9ba6740ff94b299395312c0008bc9a1f72ccd1ad5d1dfbaa0528fe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBBRQ0500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81283874058c80dfe776f686b2bc703bc89d0b7c1954268f80a54b6534a302f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBBRQ0500122.