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 0xd2a32b09e5c99d97e6638fc6f4220125a36f2ee2667f7261fd8ff01479cf8088. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/088e4465-e1df-46e5-aac3-5dff2a2bd823.json and https://artists.proofprofile.net/proofs/artist/088e4465-e1df-46e5-aac3-5dff2a2bd823.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 0x6cafbc944d4dfed1a4a45ef2e768e16d96e189e79343964f3fbb975433fca9a9. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZTBF2386671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb216592b030d3007f501a5a832a7f5502601a8d085e6d7978567139de0fa4145. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTBF2386677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ca22a1ff8200eafee5fd54c02fcda1efae5c8d168c1511894b11c2610c7fa0. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZTBF2386680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde916d7ae68a7ca6d2dbd55bca8fb930f748cebc63494eec0fe5c97d59dee6e. 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/QZHN52161399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3600a35fe30eb6c90e095990a8a2dcd292a2e37824e9f59e3afcfbf8cbd828db. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6H2463451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2e55b22ed85500e7fe2f7b9853998e2750010f283b70c3b52647f857f504c2. 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/QZK6H2512023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920aee2b6e16c6651db817d5bf71e6cc0cb5b621706aa50e24d12e603d8d8888. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZK6H2512024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84ae812443d3338f77ebb1a899d7d6874b9f7066de9c3fc1a2c9cf700c2d1a6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZK6H2512025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb2cfcf622679bf474b17eee39b66338fcd45499065d25e3b70b4a3ba7705b9. 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/QZK6H2512026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf5b3f43fe9a61d80c8a681d016ff9d012ee48a7dd24b457a3de71bc3855bdf. 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/QZK6H2512027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148430de35992214f0163d2c26ae9d532dc3177146deb3fbeaaad9c6ce05d0ae. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6H2512028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978a850be3851dfd9b409b686c5ec4d49c5b6f523336f7d60ad72c65e3da793b. 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/QZK6H2512029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442b2ae19e11c807ced4dccd5e5d2a64ae1eb324f936c435d67f3982f4bc4bbd. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6H2512030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6212a5b5c76e69d359a521938b2e3c45e75fec4706862a2d6d2aad648858e5be. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6H2512031.