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 0x0c6c1cd4e78df7e21da0cf387b502ae13b280a3a5970905634225431f5350c5c. 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/039a09be-8fda-4ee6-92ce-2a3c9f1254c0.json and https://artists.proofprofile.net/proofs/artist/039a09be-8fda-4ee6-92ce-2a3c9f1254c0.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 0x6c0538a9a73c3ade43e60a09e48f509ac90f2bbea5eb5b4a03d681e093f3d950. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZFZ22520146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d08f5ff36bab439e10c1e5422c0d8769d3d99f8e7a238a7719c3b74f857f86e. 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/QZFZ22520147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763011b327f691a46a435129c9f80fc530bca379064b760cf6697424bc2ead1f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ22520148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2e44893f8a0f4e2ac06cb70be4ebb68a7b75143c0c81f5ebdb02c92631d98d. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZFZ22520149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fbe7578ecd84c411fe7be0cf8e4cc2dee2cc2ba0b3ec9d3333900142a0529e. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZFZ22520150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a9b4457e8996ef93efbb3e0bf7d1812e471705023f156c29e586ac62cfe711. 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/QZFZ22520151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8eee086ba198c2541d9ae236cd0fe8a01e9b4a69c8406ac1618c6a1edb2726. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZES62596264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c02c56ba4dd56a3dd8a50572ee1544080e8fa74e614d6c3c33073736d6ff17. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZES62596268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf214611d73fd846a971443b84fff7df9d48026f06c966022a988bb6d92fa6e00. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZES62596271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47e6689cbd00ec0a4e10c4b3b36585fcf9829d81c9a718f6e638fc8e49ce2be. 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/QZHN32564253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8cb342177136d47070eea7cb55dc2b3eba04179fad3030a7d31a08d75849fb. 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/QZHN32564255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a042321e7719d31d87d53248fd79f4dc76c20ea9d8d719f44574b74bf2114fd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZHN32564256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cb64ff6a506fde0688614274e681e1a5146675c6575a616a58eaffdedcf958. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZHN32564262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f4b9c1c522035d724c5f76f7e634eff3c01dcbb4a052e472bf0b9785c4c009. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHN92579635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb9a069473c7b6cc252b98811b71a9df48ce0a5e9a10b5b7f167ecf19e1cbe. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZHN92579636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8894d233b9c684ff57abda9389eb1895979e2d6d269416669705e4e4e9225820. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZHN92579640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26c083eea14cde7f267ee0c8e1db8dcfdd38e0559639cec5e2da621cd603d7b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHN92579643.