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 0xea6beff1cda1eafea7dd587a0d3f25e6d44c86185af3a308fd38ae8e8bfb0868. 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/b1a26181-e729-4314-ad89-29c3ef4281b7.json and https://artists.proofprofile.net/proofs/artist/b1a26181-e729-4314-ad89-29c3ef4281b7.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 0xa361e449077268c0ce17e2d111d01818da2ba6814eb3460b3b6cebd8611ba8d0. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:41:36Z), 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/QZGWW1917847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa361e449077268c0ce17e2d111d01818da2ba6814eb3460b3b6cebd8611ba8d0. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZGWW1917847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8d176b234c395e64b992bebd8d6b498658a6c08d56d4a46940722c45de26aa. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZGWW1976674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4b5fd2e6c73049d96e8635925c6fce92b12c06505b050436b7f2dcd2dbb233. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZGWW2117644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d88c51bd1446a94280b30fef8d5f1164c3a6df3248dac774d54705bc59e60c3. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZFZ22182824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d88c51bd1446a94280b30fef8d5f1164c3a6df3248dac774d54705bc59e60c3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ22182824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f311c7fd320fd93ccf9a5bb1848e3f2950df0a58b5ecb1801f34910eed6b5a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZHNB2190828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d782ff595bad58d5252d992aa5ab54516644b03838d5667309da547226bd3e. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZRP42156995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdff5ee3894218ccc0f10bcd1b6cf1eac1a47f5f7f4bd7366fe4cb2b4493601d. 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/FRX282244104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc6b648e84b737979e5eecbb02225939e60cc5557df0f7820744c2c7daf4efe. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZPJ32180363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc6b648e84b737979e5eecbb02225939e60cc5557df0f7820744c2c7daf4efe. 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/QZPJ32180363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bee0a4933fd145e69d749c10cd91919664f0259e405ae315c9e4214b503176. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZPJ32376328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c56d1a1795bac22ae6a4cf38f2f0e9a0ac4004bd148561ced2a0eb049779ca6. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:03:27Z), 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/QZWFS2477899.