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 0x401de6e3c09c6b154b1cc8328bc44c00510f2b0bc847893768399e19c3ad5d94. 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/2f69866b-35a7-4ab7-894e-90b19509680c.json and https://artists.proofprofile.net/proofs/artist/2f69866b-35a7-4ab7-894e-90b19509680c.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 0x89079e02adab3ed9ca327995b675d180e7c4cd17513ae9c12b41dc298d9783fa. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/QZDA51869723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb8b7715e6b820feeb77caf1f58eaba928eb3cce2cca5eaec0afa1187fea45b. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZDA51869726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052c4e23034c406b67d573c97f4caaffc0022dff71971c77ad7295fb6e9301f7. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/QZDA51869729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898d6a49e4de1abafad511d45d4be9c2c2afaaa6f3a785e85462ae5f374b530d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZDA51869730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b77c1b91a3ccb7b44bc87a1956691f3f3ecb8cfc9e276000b4efe1bcf1959d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFE2433450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e6899b4fcf065cc907e27af5f590786cbace10a6dc7269b8bc3bdaa839a321. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T02:01:01Z), 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/QZWFE2433451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df69e658d50dc12416f05579b20e47d648ec8b09269970964be577127ee0508. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3EX2443930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e94efdc5de8c293cc5a1c4313e93361c2d2963eb676e09a2c36d67dd636d08c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7Q2576370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da48a00c1e8c6241aa921d256a9266c980b7f04579b8d1704cb6c93e80b95d2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZZ7Q2576371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625f9df907505b485a1c9c9c6826cd4ec98913c3d06052811aecbeb5b220a533. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7Q2576372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7938914d2450409a89eb669648d0078fb263bc38734689f21209f16e84d14a50. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ7Q2576373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6885c693a37be9990ffda1a89657083aed71b4d5aecdea91bd5f8baa0c8181ad. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7Q2576374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3162c0d48ff96c33229d8edc6f2b6d40df2cd3c6d5a33289476799b1b1bcd922. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7Q2576375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9de0d7324ceda9ea29b2b7bf210b1de8142397831f358695b93fd59c62dad7. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZZ7Q2576376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7889a3810cd045ea4ef7122f0de365ae1092bdce94072aa56ed8f96a64fab54. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7Q2576377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8def168b4fc1c9db55c7b9c8d0b9a63db0027bb60944a3f15a342aebcdb7276d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ7Q2576378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e892d30925092ae702b36e394091c860028557491d1b80dfc284bb781ded2c3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7Q2576379.