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 0x7dea0ac4f76214f4fff78222273c96d5c4fdddb6746251bf351eb06d84f5dd2f. Chain 2 (Bitcoin): anchored in block 953820 (2026-06-15T18:35:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff3d0993-5bc2-4a55-b7be-9dc86d6ffffd.json and https://artists.proofprofile.net/proofs/artist/ff3d0993-5bc2-4a55-b7be-9dc86d6ffffd.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 0x1ed49daeb8aefa1b630c3acade573061b64a58b45493f8e0e2dff19a907723c9. 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/QZHZ42113940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f81c94bdbfad74bc98ac3e5b6dd0bd3102bc2e610132ed26a39d416388295df. 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/BXSVC2000223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae05f7ea640eb0f5300b7d044ccf7f6c57ae4b3548d63f057dd8f3ea38da672. 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/BXSVC2000221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87c9ddb33a994c926209b01491638b5551d4ad06a8615f1f962ccf15dd7e20a. 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/BXSVC2000216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9d05fe11d33356a727eb7124bf5046bfbf77a2354220ae1b4cb01eab887745. 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/BXSVC2000217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77a2b6804b55c1bb5987c367f08c40318a718cf9d808dd6b35c9b9f7a016a28. 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/BXSVC2000215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4f8a946b76011b06a4d9a51bc76941e4d8683591ebc55306fb6f05b22796b9. 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/BXSVC2000218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6648f7e8b3e0c577a2a83bfaedaf06bf7fdbfaf712fc078fcbd99b59e5fcac. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BXSVC2000219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f81c94bdbfad74bc98ac3e5b6dd0bd3102bc2e610132ed26a39d416388295df. 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/BXSVC2000223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d245d3cca321cce3e0b59a41e8a4de85b94516dc42e0e95282470860ef526bf. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BXSVC2000224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9beaaeb0049bc66d80a69c994682734e02bf6b5086fafd8abfdfc0c94ac2f1eb. 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/BXSVC2000222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae05f7ea640eb0f5300b7d044ccf7f6c57ae4b3548d63f057dd8f3ea38da672. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXSVC2000221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7072799df31f91c30ff2cc79aa62e6e1ec6c6391c4b0176313b7ad43459646. 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/BXSVC2000220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39084f6d93bf092d06adc5080152198b27ce88597ca1e4af9b4eba7fedfdd150. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXSVC2000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678614500b5c0b7ea319346d8a7abe8d5f74f9ded618694ea1f83206aacfcf0c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BXSVC2000226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0edf9c9f6dd1eb683a5127e9edaaed4a02f5ce7c942f9196230352b5ca349d. 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/BXSVC2000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028f6064d91f70be1df5d2e5e4386919f9e41d5e1ae7a04c728db6477cebd84b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/BXSVC2000214.