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 0xf722515796b42f84a99fab56c0d50d44279a6931af94707e9a54ad3896251a8e. 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/9a818a54-262d-42bb-8e4e-bf3bf1ca8e9e.json and https://artists.proofprofile.net/proofs/artist/9a818a54-262d-42bb-8e4e-bf3bf1ca8e9e.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 0x15e1a6d6ef7da5607b24911df9ebb3a4e2f90cd830400d86eaac07b614b1f95d. 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/DEXO22375755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d402d55ed4769b217a4f413d513b90373ab67521163848a3ec079a82d16e19d. 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/BEIW12300575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885c78a5c5e18e9287ce775b869072f395d25e8241564cf3a7284f94fe0f045d. 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/CHF032403729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac52371547b536835dd9047fdb1ff2e76f6d15b1e2d41147c746024bd61d9bf6. 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/NLT2H2200359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38621592aaeecd4c0837184eb75082e9203dd7c250a421801a3423bef25b5435. 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/CHF032400187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7561d31862e81b51c40c85781b0636d0fb6e0204b4c016eee428786cc83b96d4. 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/DEPI82412063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde73c5008cdf437498a787543da3bf5c944c64d2b530121459d5ffc0c2d0199. 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/NLRD52340559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba26fe8cb08ec31aa3784b08003b5f8b394ef3b37625d2af3b377ebeeac655d. 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/GBLV62315989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc733d00cc86384fc6a43761d2483aa1121d228c10e59338c5d6bfa1603c9e90. 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/DEXO32385272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532c6e0254d96010e1c87e0a0ecc6bec9b1d7b7278eb1e3328ba5dd3fe734ae8. 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/DEPI82322515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b0494d506eefbedcdaecc1d3e5a30cf2aff79c41677632e9556348a77616bf. 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/NL2QC2101070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b04318dd12b0f4d74a096cd0c1c09ea478d3bf1dc073707a74c5ec92a8b86ea. 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/QM6MZ2393604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e30caa2ea157743b47c688aae4df98a6bae5c842592f674e1f579071e2e5c4. 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/GX8LD2330875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e6064b30c1e9392387ed8f7cc399a44f5b600f9c25e93bd52784b59af6fb6f. 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/GX8LE2289252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6c556193b78059b98c8d3874a6f3223d56653e55ebfdcf654a86d6f541e020. 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/DEZC62209143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33891e8581ef86d4c9ebe28b7b0da9f23af91f9b253c1ea2697b8a7bc6df1bcd. 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/QMBZ92296191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf914a96e78e780f422bc05b36ec4418b26b8a1cb5f01a77e5614c36f0ec1cd90. 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/QM6P42210335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3979b6dd76fbef5e24aaeb28c83004af3ca4599b7bee4bfb603de5487ea286b1. 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/GBKQU2256649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fc1a71a8f0d7e67d19e3c2d987cb76e1aab2eb147176f47a1631a39c868743. 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/NLT2H2200184.