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 0xdf86f738af651f883a10c470e4c7b3f1e3b1c8f865dce682cf2b58ff1a3570d9. 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/70987dda-1ed2-4886-8fd8-471c95495c15.json and https://artists.proofprofile.net/proofs/artist/70987dda-1ed2-4886-8fd8-471c95495c15.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 0xd0644f4c5da9474d6648c01d2147dfa110159711245428d6faad09a972ce6f23. 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/QM25R1500401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c211d0c232eaf10c194a4c6000cd3f7020f263de13ba913030d21faee6e5dc. 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/QM25R1500402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0918600932f5b298b5f85db9c0f5bc2ad9b9788377666cc34e1a2e8f6a34668. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QM25R1500403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9aa3da494466ade09d69ff652772ae018cc74b75ce8ae77c7e2248389bbcd9. 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/QM25R1500404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61be80da77150384832263a6002dc13e5271a038686759f588515efde93fa26. 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/QM25R1500405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b55aa0c67b21465e239265183b47901e9dd8b8d1d672fa66cd78ae43035e15. 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/QM25R1500406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8901d2dc37e0ba06ff4b55606ac648f78e2db244ac8d9816e0c291007b950edf. 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/QM25R1500407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892139af83b64b63862b4e3dbfcaeaf42718d9346a7a4d8458e1f2f83bdd53db. 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/QM25R1500408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb507610bb0023f0c9e7e03622305d6cdd081c48ba23d2b72b5d3b341da281ce6. 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/QM25R1500409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56056ec2c7843a72c7278318eaf79ec66ba550cb2f6c1f7bbfd8c87776bda590. 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/QM25R1500410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9287cd78d24a7c0e3412b98e77399a183d6a22cf7ef36d16bb3c65dbd93e92d. 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/QM25R1500411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4acaf1617a89a4c1989072c208d56e911f319092e6eeb2b0788b77373d851d2. 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/QM25R1500412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19962b125db8aa7b0bb767ebf935c374bea452b5ccd47672850153ccd9b60dfd. 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/QM25R1500413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4abe2762d31eda6f6ab27b1cf1fb884d2bdd50a0e1c11fa3cc08e68b4cd3a1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USSUB1618301.