alt=|thumb|A painting by Vincent van Gogh depicting a caravan of nomadic Roma Nomads are communities without fixed habitation who regularly move to and from areas. Such groups include hunter-gatherer
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ecb66a649cc5278b5ad79a89c9bb05c47249639bb1ebf39a508fa5594581d3. 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/67471991-c51c-4692-96b4-09ebd7d3f7f8.json and https://artists.proofprofile.net/proofs/artist/67471991-c51c-4692-96b4-09ebd7d3f7f8.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247d2af34ae513c381794fd7b0b5030c4eefec36307736ead96b9e683600004f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:42:43Z), 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/BRVWS2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa26def674037897373fb758be5706dd6dad3e2da95ebb6ea21f6ce824ce208. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/BRVWS2300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6d9499e750d25519e69b2a246a7849df440db5e167fbda43631649d1054046. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BRVWS2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2576267f94eb5d5bd554af130c8cfd4450f02ceb44d5ea28d578a32d8954d99. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BRVWS2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05c1c50d0cd72e3b6d55f0fae98cdf031dd24067309592e17b71d60905f03b6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BRVWS2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c5e1a12c78316f5ed9a7a072bff0bf3324ec0daa1ecd6a772a668e60534d62. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BRVWS2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a912d20f4ea23e80bbd5669f44914ffc9ff5b2eb52917b47841773bba8556fa. 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/BC4TH2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320a7cb86240d6e94454cfb66393201d7a70e3bdb4a139141281c52fad23539f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BC4TH2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0a5fde6f0dc982a11a823c1091d17acd21477b2c1e813924e508aba77260e9. 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/BC4TH2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cfe2d8743453f867a633192fdbffd63926ee718053ad0b9099fa0d944d81b6. 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/BC4TH2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f4081c2aae5f7b924dfdadc54aae88f9219238a3c1705fd7986988a141d0a0. 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/BC4TH2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a023b935e79622e27df271e6084ba6c1ef072d365215d7597024d08d71da78f. 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/BC4TH2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593a9ede35d2ab1a3c522f1b5bef21ce2089ecb455a6cf4ef22c3c13be74e1dd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:47:21Z), 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/BRVWS2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3a43a38e35efb49fcd8fcb6bf080ff46d9485582de53b6df84532b7afb408b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BRUM72400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bea23499334cbb0b29be384a829a2be3eda8d7bd6b5367781816019eef5a98f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWDD2449839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb82a5783d9d35f2fdb862d56a24f7f1cb4c76a6948f6360057f2f715c0cb55c. 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/BRUM72400124.