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 0xa7075a4a9a4cfb637b01f39d6e89cfd4a703adb355cc6198c1663bf523b9f2f3. 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/8ba747f7-0261-42cc-b7d0-8fef22c49ba4.json and https://artists.proofprofile.net/proofs/artist/8ba747f7-0261-42cc-b7d0-8fef22c49ba4.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 0x0d9f148a45011b8da88072935043f7312a447e72c461dac0c1a2479272b30185. 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/QZDA42511200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39efc6bd4dc58128a45fd8efd94b92b014371f2e2133c0de1a215080862c0b9. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZDA52503392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f8b07daf6cd6b3e6c8b02b34352a015b85e359354823331fd2bc802a0e8860. 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/QZDA62530131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554a7c37a25dc3f1ef5aadbea88c0f339ceb44b33da396aa1a29419a0824310d. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZZ762462407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8951dcf2317078191e33a467c1e25cb2a8a1e2cf564c9b7b1a1fed175282035. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZZ762461071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801863e7da41e7dfad40e8e9ef1559755ebbd48641f0101b9120f268f8f3882b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZZ772445194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc770c35f8c79112bd07a452d7dd4555f7bd40b678fbd81cf0a96768be97252. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZES92552299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933922fe415f6eed6e76265263956c45b916c5c922c7fc94202bcccd8686af37. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ762446117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5bbbc00c125e9bb09a8ed2c3d352fcc513205cb27e06905e5828b0d63fceb3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN32571446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9b9f43091246dd1b0553fa443afbecb7bc77d2e8eac6326899d2f12637e80c. 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/QZZ772453226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5442a81b18b7d2a820b1d1627e23a9afaa20f6f1fce6cf3b4893b21cbba66899. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN32531271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2c2cc5ed499a385b9f6530df5270563eab49fad904a36ff7de63ca1a62eaa8. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN72538956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5bbbc00c125e9bb09a8ed2c3d352fcc513205cb27e06905e5828b0d63fceb3. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZHN32571446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4684b1cc91d756a7b31e30b807b80ed42b1ee6a91da35f3284e74a7c5aad50d8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMEV2536771.