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 0xc292faac1c60306bc4513bfd2902e7b6f775e4b6ab73e0ace62c1ddace4cbc40. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ffb8f8ba-ad96-4f40-af2a-853f32dc34b2.json and https://artists.proofprofile.net/proofs/artist/ffb8f8ba-ad96-4f40-af2a-853f32dc34b2.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 0x6bc048aa164003af7aa31543b84204234f1cd6e636d5cc3e210bbd22bad506ee. 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/HUB122424001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ce4922fd2ec35b40dbed2b346d871440ac4278038a24d85a0ea20d0f6022a8. 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/HUB122424002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207deba9b937e6cbcc0a2cd206a9d5debea81d7b3688f2115e269cf236d70906. 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/HUB122424003.
Forrobodó - Asa Branca - Maracatú - Prelúdio from Bachianas n.4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb283d72d00ae290e5b0ff779fe8ef91d40a3386d534f26a8c1006a7196a481f1. 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/HUB122424004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80211e05606994966bae88dc0998e3f8865b5ca6cdd605128e87ad7f9beab4dc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HUB122424005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43fa2f2122319824f1fa685b46d62f71c2eeb41324abd7f745f48c30ed2cd62. 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/HUB122424006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e5b7b569cae7fb600e699578cb952c6962dcb1939a53a649c37e249b5de98c. 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/HUB122424007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034fd3783597e84ea1dfe2dddbb47bbbfe3d34eaf5a15a796465e56902dc4ac1. 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/HUB122424008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc69be3bf80c7222cb78fc75db8954d10711942041c694af0806b5d84b3f53f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/HUB122424009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6077b8d105350b8b9c9b001d31645b115256e326a853dd030ba466e38b431208. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HUB122424010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9884ece6e67b2d5408f202da5b914c018c86b6a6fca94a5498874164ddae31a7. 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/HUB122424011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0c58bc0623cf9b06bab143073fbb21eaf9a99af9da993bdb48e8fd1436e128. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HUB121809001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd767c4551a383993bed930a8849e654b4586b53c36992ad06ac4884e10f50c2b. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HUB121809002.