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 0x9f990cb356eb972d8a0effc757de6a361fa9280eda8e874c423e44fcf8f30387. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a649d6d-7548-43a9-bed3-73df0562997b.json and https://artists.proofprofile.net/proofs/artist/7a649d6d-7548-43a9-bed3-73df0562997b.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 0x144c06d73ef38dc7ae262a84de7b3cd4163e26045b906a976b02827159aa8e5f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DE1K12408101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9351977a9417e993518783e6c62d36b85d2104f3edbf94a6e5c9032e9dea0415. 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/DE1K12408102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40d1f472834cfbdd59217d888a8f729a37d3f4dd12aa73070ed17e32977d92c. 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/DE1K12408103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19b59d779e303d248a2cc293a8940fe3a3a8f4acbbcd73486f9cb1596bd84c4. 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/DE1K12408104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c0db1cbf0dd48c41afcddd2d67c48610ad6b18baa03d714c7c3f2c2ae3c016. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DE1K12408105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcc516f98b91710cb80fceced8e3fc4f716df11887de3d327c73c0a7b9d9ea5. 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/DE1K12408106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456986d78bd2c9cccb5f7dbf791818cddf6a0f43e274c2df413993cda12be892. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DE1K12408107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec6f5bc25795e714c4c4ad05463c7f478a5d2c61dc3af1053cb002bed493642. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DE1K12408108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf99381a7f83c5d51b78835497784c31bdc984b35d373a52168bf8db93524e4f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DE1K12408109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e19fcfbda90818d42d644b3848dd53bf67d6902239fdacefb7f30e0bfbd79b. 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/DE1K12408110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa679db683ef2447c07566e0fb04b5ae6ed8262a32e87c42c3d015b768f935bcc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DE1K12408111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcc516f98b91710cb80fceced8e3fc4f716df11887de3d327c73c0a7b9d9ea5. 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/DE1K12408106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e19fcfbda90818d42d644b3848dd53bf67d6902239fdacefb7f30e0bfbd79b. 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/DE1K12408110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40d1f472834cfbdd59217d888a8f729a37d3f4dd12aa73070ed17e32977d92c. 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/DE1K12408103.