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 0x47d384ed27af058cbc0d662762ea35f9a3866320f9b5b14103ffc28d07e9a3ee. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b6e993d-216e-405c-9ebf-5a8c00aad2cd.json and https://artists.proofprofile.net/proofs/artist/7b6e993d-216e-405c-9ebf-5a8c00aad2cd.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 0x0978c630f164e5cc97bdb84b1cecd7feafe83c2414556d61446eb856e44285f2. 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/UK34N1801016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0756995dadcffec6463e2f6f73a515f4cc76cfcf36570eb19b4429db2408c17f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWZ2402614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e15c747a9542082eb34226a08717b359a24130e6a8a4f729d2926d451019434. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6J2368042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544069f89b2c221a1cfe2094e5d13f29c2cadce9994dd479c2efcc66863a4dc1. 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/QZES82341623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f151e8d833e3e3d3ae383352f0a4378f2e19e8c867d599cb14e918016148fef. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZHN72238175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a2fad1348e5b154abaa1246d230cd859d68eb4ee56d4fd4009f3c1a4c8e0eb. 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/GBCFB2401248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f33f0c2d159e2dfe6ead8ab0bcbc70a34f4ab489b7198e0bbfc4848b1c8956. 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/GBCFB2400689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c2ed682e4e84321bf87c984943373dc46be884ff506d2b017a73a1f22d523d. 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/GBCFB2401106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffcf4bfbba7a27ce42a45f88602cf5a5a197430c10edd203205c217681b0688. 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/GBCFB2401249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6ccfcfe3ef458267dcfe72e8e8f73167d7d4d04ccca09cc69f8c115aa4f3f5. 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/GBCFB2401250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5556eecad09182c072d063ba4dddefe203ccc3372b8675b033d498bfdb4b4a7c. 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/GBCFB2400690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6ce60c832fc212472f89e2f4fbfa59281000dbf78f5789ea794151a69e248b. 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/UK34N1801014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2e869932a26e7e702bada8dd123d8abeb8a274ae2ca3e099d7ab36d999e1f6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UK34N1801015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f41d1579d87abd4ce051042849966ad4d1b799ebbe67379c540aba4f136a11b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMDA72323231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907ffc6e2bdfbe754692145f14880223db8da338d2d117c8f41af3c8de9ca177. 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/QMDA72323238.