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 0x486432568baf5748ca0b3f762bb65d198e26c68960fe27c9838d7258130c179b. 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/db91774a-3816-4aab-8d17-1f60bd95fde0.json and https://artists.proofprofile.net/proofs/artist/db91774a-3816-4aab-8d17-1f60bd95fde0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x32b5ceec4e05f53c6e1c99d349619dde8633db6f2336b2ad21ecf469121e9296. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USGN61206581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50cce1a2717dafeca635a5611534f9ab79fccd2a2b0133baaf3b8380c317808. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USGN61304690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6311b4967d2419c021b50893e12f07967e873c51cc2cdaa12ed09c835d157b4. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/USGN61304694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e444dfa10d343538d566b6c4490faf8c9f0f299bbecbf491091f14f4d5ca95d. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USGN61304695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2461ca1dca600948349c93a091f30986e9fb8b839c566d5903e7fc439f3d13f9. 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/USGN61304696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16499889da7f3ae159958cefce4dc8a4a9422d46f812444a75fad4ed05a51ff. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USGN61304697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbdf97ff42fe7e00dd7ac5c314eb429e5b60cc1cb5a7ff5bd1d935042374ae7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USGN61304698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa55cd489654c2fb23b6748b18dff2dbf9ad3fb06df5ce8e5b0de4e86152e27. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USGN61304700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3597f43dfb2077911a7d8ebac0139541187fe1ec4581e68d220f268274de538. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/USGN61304701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7560c4153408fac6ba8f92185a603913ab7fc8b4e07eb10be87b4c4a34ea9d7d. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/USGN61304703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faee222b8c60568470132e096a449709a9b2eee5a67f49468a178c9faaf7a2d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USGN61304704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4bfc9feaf0938dc410d216576f6f541b83745e4ccb16365184e1eebaef59e9. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USGN61304706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f01beb1abd6dc4369ae810ccfc26a1870c7f353b4417951cf1e51e183344813. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USGN61304707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844d50f00a02e43559a1ccc71429de018052123a53e329b5752bee6c04c4ad38. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USGN61304709.