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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 0xaca15bfd9fbbe8f440fd7c5d160f82ac3c3f7b71f6efb919f1601d477ddc1c01. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4841633b-1ee9-4617-83e3-fecd43eb6bc3.json and https://artists.proofprofile.net/proofs/artist/4841633b-1ee9-4617-83e3-fecd43eb6bc3.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 0x68af3180a86ebd0d92255eee5fe15c747a06e7f2a83c105e44a3336706d33b6a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCJPW2306516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f4b2ad2d28c4c8cfee64edc82e1553172acfc3944499948c74d1ae564daa02. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TCJPW2306517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035e19300a58b3f01098306fc6b732d01338757d196eaa87a3a55936088e5bac. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPW2306519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9081e42a13f80b42bb98c4c000ad39beaa2c8da47310bb6bf3660e22e5f4be19. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCJPY2372685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87a02323313e1fadb38fc75c600181e1b6fec3f2aa8c9b50bc0b45966979402. 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/TCJPY2372691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cc644c32844761a6d17a4e4ec42548f2d141b475f7cf941f6c7db8f12e4338. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCJPY2372696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584780b841be9a3362935ffd0b19bd5edefb77910f9dc2ae639207e1f96d1f4c. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/TCJPA2424336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ff853a62523e8a83d16fb04741f8ae7ea0979570e417986cd3c48dc4be8399. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCJPC2479203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ff853a62523e8a83d16fb04741f8ae7ea0979570e417986cd3c48dc4be8399. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCJPC2479203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064b2d966cac0ab72a76cb76ad64c151dea64afb52ea5ddec5c1a6c4fe3bcdf9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCJPD2596348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064b2d966cac0ab72a76cb76ad64c151dea64afb52ea5ddec5c1a6c4fe3bcdf9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCJPD2596348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf87e89e2b9394bc0d15e07b950552d2d2715963e17df24ae2e1c84926c2da86. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPF2517253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf87e89e2b9394bc0d15e07b950552d2d2715963e17df24ae2e1c84926c2da86. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPF2517253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711a318113792996db3a59d3003a84a0a4d69d438d6fca4dc97981b5ad45f7f1. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/TCJPF2517283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b5d431e53219fa22fde7009a262a1b3345a09527a2dab0cbbc59cc40130e46. 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/TCJPH2571360.