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 0x479d09cb37f8d71bfcbc388c69ac18cb295fa450f352eb6e11b6fe042eb7a783. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71a81486-3793-425c-b7bf-5357af037e78.json and https://artists.proofprofile.net/proofs/artist/71a81486-3793-425c-b7bf-5357af037e78.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 0x54475239c4db00c64515e3d8e2d8c149d2146baa1e370540fc775227e176cfd8. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZHN52332342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6eff2c51e718e3058ac0536046d6b1e65743684ad0e0a952f686b8003fba3f0. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN52332355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa496172ce7a30845f899a597c0750967514d803828561a44ad88d2d570f5d17f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWS2574500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5f1f3e22a9e614b7c8c4c328c0d25985f1ca2403f3853c196333d46ad94536. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWS2574501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739a2deb87fc943c917be9f61cdc3eb7584279d0941739e2c240ee080382d570. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWS2574504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcb7113ed314a1770a8cbcf6ecb739c9ffba6e57285cc00f3d0452ac75251a9. 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/DEZC62353095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526d5956349ba5b2e1131ec4dd43e17929ac2ba20839fd54bc2b76c6e1316bc3. 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/DEZC62353096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e7e5a088b8d963a2b189c2200d5b72bdc8c0faf6fb51e64a178b85454972e5. 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/DEZC62353097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f571672497fb8fabdfde4acdd4af2c4e1ed477e736ed188dd58f6018f16c4ae. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEZC62353098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df10da55126181ed3e7466eb17b55125c45d97665a7632ae0d52e8a8e71653f. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/DEZC62353099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877b40fc9446def0989cb3d69dd564900e3411b2d1f959d7fb5357b8e75e55cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZC62353101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8159c3ba20b43ac222cbec2c111f77d1a15d1b374adec7aed8f2e22eb1557a26. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEZC62353102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263bdccbad495efdec325aeb392c36a5ca5dea99deaafc40346903208550ad73. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEZC62353103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d62b1a0eb347bf47bfc22565a641a99b96d059b26bf549ac85c13c1c77cb5d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/SE6HN2408843.