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 0x81c53225d9ab9f64dedfecd375320ff9491073c7b29af119dbf4ae7ac225eedf. 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/a2a6ba66-3bc1-4e41-b52c-865d881caeb8.json and https://artists.proofprofile.net/proofs/artist/a2a6ba66-3bc1-4e41-b52c-865d881caeb8.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 0xec4cd3680df4b3f8cac183619247cc4b4a4bedaf47bf46280206f50f7d1adace. 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/GB8KE2301184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4405f9ee49ca560bb48ff552e0605b732901961cb03e76b5f2f4c5528ed552. 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/GB8KE2304792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a65136522fc5b1ba136c2e6df04c2c041320056e758f8e2ef3e2f348ce14f3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GB8KE2306909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb4dba91cd8a231cbb2af1ed04a91e98239c580e53ca0ac569f070a71670b3a. 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/QMFMG2331646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e809acf73942a24b277d4020f554781f2d97e163d0f153515dedce27176ff61. 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/QMFMG2331648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb7ce469b261b0bfec94b6c11292637031e7b3184a631a38cd32c3997c74f54. 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/QMFMG2331654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcb8a9fe01e8e544cd920bdbca971962c7c9690222e0dae53ce07125ca9401e. 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/US3DF2416886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e1c67e1b1a4f7bf922d44d4cefa810d3773c7cd3318f2a35b9b68a22b6efdc. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QM4TX2458741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c041baf0fe20ab102a712c4bc61f2443aaf482fec4be24a2f19beef734aff6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN92406395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff80a670669231765c520b39691ebb5f004e357de64747fdd698d61c39a1967b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM6P42460737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4683905876455d8e3b25af89f272515e0f1bcd10cf1587d55fcc0ec267beb6bd. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/USANG2481225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23c9aa50a02c80520a121ddb17626d4fd4ee82a54f2f0e66aebac1858e0c06f. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZWV32552994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a2bbcb127e0830f1fcefa92a6fe45d09dd5cd0c0b82d5219f3664ab8032d4a. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/FR59R2599284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6996f6f0729451fef2e1ac1b2c51560aa1c060a513d07f026c3e54f156488c30. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR59R2599285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523d9f5c68563338adcfc19261b0c58e6b296e9f8d99842b8bd3a25d83ba7044. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR96X2569664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bf236799c87907ee4cc2351c0aa46aeda4952dc90fee2bfe346e5acf2fe2ec. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QMBZ92553531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbb6c7741ae7daafa60457735690095c594f1c22cf00c95a0ffe545f16c5675. 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/QMBZ92553532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d3a1b4e7685f5dc42eaef67e406dd6edc8460031e9bf524e9c1d3511a060a2. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QMBZ92553533.