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 0x47ed5e518748ff730d2926a91681a4b4f444b6e0d4dda752a5baa0c4bce4b6fc. 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/a911259c-ace2-4f7a-b634-4fb94f638267.json and https://artists.proofprofile.net/proofs/artist/a911259c-ace2-4f7a-b634-4fb94f638267.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 0xe6162b0560d4247ee92785dbe59d1433fd786d256810025ff151bb79b68bd91e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEPT21700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a340048927739e5e7b9aba90c76e61119013d56629b9f235bd245a67494256f. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/DEPT21700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b82503ea41cedb073cc5eacf1cf9cd96a863e93c4d6353c5813d9f93f753b87. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/DEPT21700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbc003752f898cd1b8ac96838ac53d9c63f0ebfa4b23b8d4d65c532de959caa. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEPT21800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7823935bb705aa5a2164ff249732c166f80acf7a04c855fdeb1af2be70e9c9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEPT21900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7823935bb705aa5a2164ff249732c166f80acf7a04c855fdeb1af2be70e9c9. 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/DEPT21900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff5df2aa926f71b9e2e9e81e4724efea3ff7f0863d376ecbd11654f420eda90. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEPT21900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45baac7a23054068463b16a5e105d62bbb66c417df9056d0f5ef840820f07013. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/DEPT21900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c9673c3aeccce70935e1d061449595ef3889284e7f35b03dfcca1666a5ec1c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEPT21900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76b0169057179bd282d4a2d2227482c11636b4d1b618bd03341abf8fb0d364e. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/DEE862001960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0955a2d1ef655f815e080c1ebe19ce79d88260394a2d194410d1247f1c0ab35. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FRX762234702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799b6ca8330ff0a3d6bc99232ae5191cbac4039a36e90d61c1ae18d61e56438. 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/DEQ122441041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32259391f29cda88e78080d62d780e8f6635db93b94f195a0dd7ea039c06e8c7. 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/DEQ122441019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799b6ca8330ff0a3d6bc99232ae5191cbac4039a36e90d61c1ae18d61e56438. 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/DEQ122441041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32259391f29cda88e78080d62d780e8f6635db93b94f195a0dd7ea039c06e8c7. 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/DEQ122441019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32259391f29cda88e78080d62d780e8f6635db93b94f195a0dd7ea039c06e8c7. 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/DEQ122441019.