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 0xd309cb03ccdb6c0a29c2aef008ad10aa724965bc3e91384f21a43d307bbade14. 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/99357d16-0391-4af6-9ab7-ba9bf958f91f.json and https://artists.proofprofile.net/proofs/artist/99357d16-0391-4af6-9ab7-ba9bf958f91f.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 0xe1bd59ab3fd6ea23bfe3e77b2afdd9a4d39a969b3e49351b379addd890bcf8f3. 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/QZHNB1987664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f025d14f8e0d83beb7f4d4781ef337e7a362dbc3f234e3e5edfd2e3785afbe. 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/QZHNB1987666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca8bbcdfd55624fdbf4031140ae77aabe3ffb1773861bbfda15bfe272e361b9. 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/QZHNB1987667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da82d441076efde7d9f8c10ce25e62e27678227e6545a9c8babecc8efc35116. 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/QZPLR2256293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b431500dba44b07e8445f9fba29fe8b0110e24cc3cca0d541d3707b5619f507. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZDA82091095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca8bbcdfd55624fdbf4031140ae77aabe3ffb1773861bbfda15bfe272e361b9. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZHNB1987667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94f07fe23ef05283b0a3bd07204783e32ccba4fa7fd9b0f143743c01c6b653b. 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/TCACI1508144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c41edc0db0bb611fc77c34a5653aaf85ad1d1ff2976ecb2c77c28a1d9e739ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM21521553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe895e70e83a092bffbfa240e1981369f82e58e6640a0bc288ed727c4777cdc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCABI1252228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc1c2d500a4f3f10b9e183bfaac216c490eef28d8e76d9a30ece85da8359357. 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/USHM21338378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6ab76bc092d49cec505c7867848e8f079e546c7cc535da67103eef13c9755a. 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/USHM21290844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f575b431a5c3861b22a71a725a969eb346df06ae582d7b25e22943b18ea035. 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/TCAFW2117300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812471c5a359da2ccd720e72af7612cd5ce3a7118e08e9da65d0287c077dfae8. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZTBA2280033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b0017e983a1b4deef500567e7169078247a291a1d42dba48a97fb5c6ec8867. 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/USHM21878944.