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 0x1d0883ac2d1bffd1df80862c0fc38d2ab9dbf26834f90f10b2ccbb80677da91c. 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/8e7be98c-7b77-44f9-b6d4-e3a32a3efb8f.json and https://artists.proofprofile.net/proofs/artist/8e7be98c-7b77-44f9-b6d4-e3a32a3efb8f.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 0x24b80f399e9a1fbe4a7adcfb764fd33a24ae6ad866b59b8890cfd03972d35d47. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZNJX2394370.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e79cc03a00a0f355dce5af49c78b718bd1ce355dbcd2a5231fa6cf59969144. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZTVM2292658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2b89ca3cb29fa6b48c15774057b386bdd59863287e9ff17e5bd1f3dc0a2ccd. 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/BRUM72301934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36d1e3ae60ecc647e6306e7a25c1f55d0533d930a0bc1ab31e587e7f52b8e0f. 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/BRUM72301941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79294645c482c0144284be6dbd4079848af9886812c00be729975e2fcefa26c5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/BRUM72301940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bd5a95561238b608bedbbe6cf887678d2d474c4b5590d2092ea82ed33664e1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRUM72301936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd82438fdbffb3b3c9a5fbc58b7ab8d65624f0e1a497a5e899484cdd412f83a3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRUM72301937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624e9c7941340011916e68dcdfa985df6603e5186cf6c5f7817391a98e96e515. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/BRFDK2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4913f73cfc990c81dfedbcaf10475038fce53884d5111292f307f3df6e31c94. 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/BRFDK2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7342184d6278ccb2a1d3360b68763ca5a104eb49cd873b388c9233e877cb9bfe. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BRFDK2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7710454c9d4a2f4dd4138ef79339236ca58ddaa53afaf6c932879502c18087. 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/BCBTB2200004.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b482862fb421fb3f09e6aa1d05e743f72616cc8719c0985d6c46def90b7d815. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BR6RI1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b2322f10684030abad433141e7b37038fa94ec74b5ec510c60466d35e2cbc0. 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/ISRCB2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4411ef1dcf19a27c6245392793abdffa2b5fc98d58a1c88f30c613cb20c3e0. 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/BXDP12400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0d7215f129ac484280c2a9686562028d77067384ef66019e6405a6fc15ce65. 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/BC14H2400005.