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 0xc1fe30c48ff37adb29b58fe4f733652655f02217433455361acef9ed563d9933. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cda4206-04fe-4576-b0e3-fc29a5aacb57.json and https://artists.proofprofile.net/proofs/artist/7cda4206-04fe-4576-b0e3-fc29a5aacb57.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 0xd55e2cdb40195fc4d38ea133380018b3f4348bc79951ccc3c4eaef9cd4bc1487. 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/BXR4G2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe082ff6381b26ba735541d76706e8327c8a486a97114659e6f3d441f53d471. 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/BXKG22301475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08373d06f6af2067e3552a8b9ffb729e507751e778f9c32c335647cb6dc3d6c. 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/US7VG2259957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5b2d215357d2227aeeb111f12916fddf06f734f2127ea183aa6ecae164dc05. 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/BCM612100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bc56d9a6e812a4450568852a09980ffe73ba0b05ce6adf0b17ec665c1da5c1. 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/BCD592100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b83f173029233ddb541e5298e932d4bc3173f8310e2b0fdb38d0dd2d3fe357. 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/BX5UA2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aefa79467c5d24c10d49461f242665f9a7ebf258f946c22e6c75bf0b3ce5f3. 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/BCTQS2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abaf1c4eef5215d2bcd7d9b442c92e90f2e4d09de0059e6ad88ce260c1e209c. 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/BX5CZ2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace8713625ed8ba73b2d7ee3214a1d5b1bf6174041dec721a36bc8f877b7fa80. 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/QZW9K2486013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a9c813c56887d55d1859f061246ea09f46c275ace72acde0332a5d7e3733ff. 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/QZNJW2431361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01852d753cb55b4da48925167f7dfe251308b7ac30e3a1f3ace8bf091bfe72f9. 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/BXXB62500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5017128f3d7380f652a8aa67e943d2d55d7695e922efdfdebb1f54fdebc78b0e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PT2DY2400588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6561fc70429d914e4dde90504ec6da5525b2df9b564b666514e0a0ef0f5a370d. 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/QZTVM2441473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200578143815709b977710a1be65043dc789f77d9fe29f31eb381c1f8fe9de89. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:06:24Z), 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/QZNJY2453191.