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 0x729e28310a20429efd4b8fe06dcf863c537c7f475ac2e9a5f408f88657728071. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/253c94db-e532-4fae-9e96-32f92b9aabf2.json and https://artists.proofprofile.net/proofs/artist/253c94db-e532-4fae-9e96-32f92b9aabf2.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 0x24969b9b1ceb53592f07fc3baa840db8d8c590f9ec4e1332ca4c940266fd96ab. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/HKE101500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61c5f9c6e9126560143535699efb2d76c4565fe12c6dd287ba56150964355bd. 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/HKE101500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b7e44729d18eb03d28a867945f132b58e2792914adb6e54d0008afde7824dd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKE101500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830c4d3109d3738ad5725fd45422554d68afd65729e474bcfd0be0646a792bcb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKE101500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95d15e4a9071ac0c8b563a9c97030895cfa03fedd860cf034c9a40b4c793204. 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/HKE101500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e05d5dbe2be762d99bff9bbfa6a6a2b71330a57e283a8024dd81ca4bdf032ac. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/HKE101500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778f77264e584ec2ad8c015b733bffa33e2c50832e557035e809c424556fb10b. 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/HKE102024002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac8d3058423e4ba495df10fc3657e99d129d5142202e4853971a35ca20d33f0. 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/HKE102023005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f782c6040c1dd326c078542556fd2292a736eefae8e3bfbda886e5985f67eb2. 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/HKE102023003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9117200b848f1e0427ba79803ef25cffff15a1ca0c48129d4eb831a4bca98cfa. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HKE102022021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf22517780ba92e664b98859e2026a13d5037507660e0e679389e72052d50e50. 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/HKE102021020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be26066fa8960f3d8f6bbe61496557ff1b5f5c7804426eceec1fe4fa4d4ee29. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/HKE102021018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538eda0ff97ef6371d913127db2c31690edf700265df6d19581fa73957c54cb2. 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/HKE102021009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c572a7249876b3131f8bc20225da27d607dc19f7b461897fb152b5857a63a23. 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/HKE102021005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30990eaef3a9aca88aaa492eb3ea2b00952f43f6d1bae7abb37fb4ecc4e4af4e. 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/HKE101900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ade313a75c6c4b5678d123abebe04636110fd289c51a7c6793f0ba49fdfb1b. 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/HKE101700002.