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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 0x562fd41ab29e2c69f00f50f906cdd9725c20fa8f8e82a61c08ae10aac459dbbb. 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/036f1a91-ecd2-4706-9b5e-2b545926360d.json and https://artists.proofprofile.net/proofs/artist/036f1a91-ecd2-4706-9b5e-2b545926360d.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 0x6c8806c8dce8b7584c3cb4ee0dc07f3de0ac81c62c246b8c81ef16635e3fddab. 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/NL4NL2106834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc587deab26a0b31721cf2ef0b590ba8caafec4f1e880ee6b0236d141891619ca. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZHN32393536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4a021a69d0adf886f785d6b31a8fd9cf14935780486a8b329f9a7b6f7ff426. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/DEZC62271026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe602506482e60a1ea8f19046a42e6dc44ae9b827861174184a8bad58e81bb8d2. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/DEZC62250797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e1b36a3a88913b0aa4f6681e543fbf166fde0bf74da0311ad8622dc8697a52. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEZC62142987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6e168c03aa6c4a937367ff838aa6c8e39dc26a596b836b14d2c898db61f923. 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/QZRP42194619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e2cc9a3b232ebc306fc51f14441150a5daa3313e9bb0f240b520eec3770d96. 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/DEZC62139237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265555e9741addacc86c12acf3195812fbdb7a5a560e571dc7e832a54b99cb0d. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/CH7812196647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af92df97d3ebf93fe0c264d5d5d06807d5d1cf8eed10f0fad690ba4209dce47. 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/DEZC62108152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b401554208e5b10ff96bd5f7337157f7e6a0aa3d2b50f7f1c2ca6c1ec0ccbc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEZC62171970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7f407734c1d31c794c5bd16a073e7b6eb0db5b83dc1e0b2d5370e30156454a. 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/DEZC62028565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8354f62de783bc8e7cdfcc58cc35f98819fa648ea9bf6b8bf9a68c459cf9a99c. 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/DELJ82055619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a52c5ea9e47d5ac651559861a4196132ecf4f715244c764e75f516318596d6b. 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/CH6541994431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba80c4162997694710aa4772c96ccddd359362bbe8f21ab054f7cb1d152bbcc5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DETO41894822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4c9ba0ba726c3456fe23a5d7cb7cfec80d20454c970f09c5dfa22126cd597d. 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/DEZC62019805.