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 0x777741d07a0584ce60073638eb1d6d42f12b95ada123c6ce26610fc7908695a0. 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/d961414a-473e-4989-8c44-29d89bdbe46c.json and https://artists.proofprofile.net/proofs/artist/d961414a-473e-4989-8c44-29d89bdbe46c.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 0x08d88177d5422c93530c64e6c78d7d885f1847245664c92157771087168ea404. 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/QZFYZ2434511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173448983d5d93699a94ab96f9c49706ff094ed901b8aec44b85ea514dd171ce. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTAX2328025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6dacd486133288580e63b09c4418248d1f4a5edaf2cd0feee3f23c5c287b8a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTAX2328020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13c03e6be153c04fd8bdda78d059046f744054b91f342dd93441b8b051ee47e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTB82484627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28eaf382f628d30a51d1a4c55689c100244527d0189e85f44882ff027de81bcd. 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/QZTB72459212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca80102717cebce6d617a01a58196fc2855231e105832128b345565a9aeb567. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZWFJ2434602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346e7189fca14ff47ec3af546b84eb07b57273d21d98cac9ccf7d25218e2b4d2. 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/QZFZ42507619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9406fd846af4611053b14074ef6eb96546a1ae380848edb84ceffe4085c72578. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN52587630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b1d8395b47cdd164e6f16a596da131604e5879ce457b76eb13119ada519ba8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWY2592280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2ddbccc0eb8cffee07ff2b4366f3d3ee722824c50cb36d906cd5f8b7044018. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWZ2561634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe797c733e8af625633d7995d05ba579fcbd66e9b847718d7144629695eb62b64. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZTAY2528224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd757c4e1d0619dee732901d87e883ea9468a86c3e75591646a276b33f0d0b2. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZTAS2526179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a31a28ad46385a3ac178868463e0ff6216a096be92e4982254e6eb931f1497c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZTBE2524427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564ce451ebe9acd23c7ab9070930bc398b3e7ff8f1490ba8ebf367fab5c5e923. 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/QZWFM2522980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c6c1417abd0fec862463c67b9ad4314e0f259a7c21dca6b0313b2f433a8daa. 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/QZZ772562281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f78c7a5ce79c2bf84845a9ea14ed7f17b8351090dae953feb29219844d45d2e. 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/QZZ7N2576027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375f8bcb15b306ed6c5d012d7258f966972bc824b51e5b0ad28dfef40c4408b9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHN52512016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb345157aca7d963f7a3b07b506deea763d592181f149230acf92132a10013c96. 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/QZFZ72581480.