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 0x23e690cf41b63319d255b3dc4b792bbf5adc7bda04fb23c96feef78ad75f12ed. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2875bf4d-d61a-4bb1-a3fa-dd9aa7fb84bc.json and https://artists.proofprofile.net/proofs/artist/2875bf4d-d61a-4bb1-a3fa-dd9aa7fb84bc.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 0x1ccca7be733dc90ce0037c63fe07af4e64e99b91206d896bca39c544fc311567. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEWM92111519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452e1972f3c819f5a5a6ea6cb2ada8a5e56aed41c3822540f36f59d9263ef150. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEWM92111520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300d43cdb39b47a5c7cf918f448e83e89fc0c62a7abdc10059ac80d5847fddba. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEWM92111521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979ea6370e0c6f4ab3b03adda19a01b17eb48701267654043aca1c1ce06ad933. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEWM92111522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d1463a0b52587e6abaab8f7e9fdc499b6c909744ee19276b0a52b469149123. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEWM92111523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac8f73f3be85ab0c9de7b38b4a88e1523bacc315afb79f4d2ac3e6ff626dd8e. 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/DEWM92111524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bf49049bffe8c9dcc026f04eac630583ecb9089434e4d08baae580855fdb6d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEWM92111525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf490fa95d4fb31bee57ce1d11233a5e8df4ccc0f916f20bbbd580600d43782bf. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEWM92111526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba33cbb3f4d0a51fd09bae4aaec83fa75e2e7219fc51f097004984373b6bb74e. 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/DEWM92111527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f784269ffe103f69b240c46f64fe5863fae2a5fdccb5c0d46e1be18dba49c9a. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/DEWM92111528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada69695820c2ad12e5443d8c2bc5919938650e13bd050326c066d5ac4d9e572. 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/DEWM92111529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09d171d88da8d2b43fe3c9a895f698ce8b149d4e445909cc7ec79407a994faf. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DEWM92111530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b97d5097061ca25f22fc154e23d76783b62c6746e5205b8184794d08231b49b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEWM92111531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c1b15e8abf79608c0cbc02af5f82f2b9686df6350de2af1755fbf4d6f1174a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DEWM92111532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae5fe50563c3b3e871f733e873d17b9b58801983388a76b226fe459fa42cd51. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/DEWM92111533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad265ad85d4ce898206f6f3d622f318201842af08e163be28f8af381b7575a8b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEWM92111534.