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 0x3ff7f91b2dba7cf8b12a815226774a9ac8a88db32206b63a5a994fd89a04a8d3. 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/d7f013f1-2f94-493f-9cc5-632669203a18.json and https://artists.proofprofile.net/proofs/artist/d7f013f1-2f94-493f-9cc5-632669203a18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bar Piano:plays Your Favorite Evergreens, Vol.2
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 0xe4207732d346758f4889e9963eb86b8fdfe9fd56677eaafe37c4c9efb555bf3d. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DEDN39735021.
Bar Piano:Plays Your Favorite Evergreens, Vol.1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f2968c46330d487efbd0435ff9e2f4a1f32160e6b4d6c0036f262576177da7. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/DEDN39733003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9e119a8ce323cf37594bebbb3e8be57c26ec42aaada2ffd4dc23fe8f63e8b3. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/DEDN39733005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3773988d6678f74f300f586d5c176c8d67f0d7a0d08711a4b81c80ccaa5c26. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/DEDN39733007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f6af03b0939da527c827c860a47ddcb850c3db0cf4663b64b6faa1029f9678. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEDN39733008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa066d6f5aeb28f1f771ebae8c6bc3aa19346c2d71e1d6152530b196f78e8982f. 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/DEDN39733011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8a4d8e2911f53256138a10c211969d1c2361bacf4e8affb747da9f1fc06300. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/DEDN39733013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f7d0829c6e40751d69f805e7631b3125ffc98f122491fc67b4c2cf47c1b9f4. 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/DEDN39733014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9cb5e59e500b2601262d2f4e488e4129d28ace04daf55d2ad86570a28688ef5. 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/DEDN39733021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2676747201579cf2493fd5c20f0d5da8a156fca1b293a87ef6dfaeee2e883c0d. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/DEDN39733027.
Bar Piano:Pays Your Favorite Evergreens, Vol.3
Bar Piano:plays Your Favorite Evergreens, Vol.4