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 0x143cd255c36e54e1d6275cd8fbb04bb190fb472b6124d6326f966c48518711d0. 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/479d13b8-62db-4df3-8087-b57b325225e5.json and https://artists.proofprofile.net/proofs/artist/479d13b8-62db-4df3-8087-b57b325225e5.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 0x55a6e1acf549b062a734bc2901ad0be2eb33522d539af07335828b862c4d35a9. 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/FRX452433597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b2fd0192cd4b67f4c7076972a509273a7eac956832512e8e086f0b1a8812de. 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/US83Z2479768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3dc656751a793d2f85ae13d6acd298a02d7a2febad04bc969e2a48282bacb63. 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/DGA062468328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0941af392ef42f8794c9a05f8409a2c679024e7f6b4ac431c65f14e067c23df9. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/US83Z2491249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f63d62ebc298c1e182900ab01cfb776db1de94ad62dcf262486c87b6308251. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/US83Z2491250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b94ade0a412eb1d6736d21a3f64118d36a3a5d0ea603b7e3dec634ea0a8d09. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/US83Z2489291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69fc89a1c9bf9205e0cc91f4563ec23733ee9a4e35ee2f2d619d9219b8ac11f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/GB8KE2422450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f126677140c785647643f3ce5c99291543e8b1dcd70dfef4b28bef6941c060. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/GB8KE2503647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ca84790b2d02a6e7b2f044d8d7050942235d04008c7b49a5535354b68e6214. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/GB8KE2503649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5353e9a915156e9696f042f2994ff157f571d932b6cf2d9055c0aea6acf517. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/GB8KE2503650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82cd8d6500277786322d85209b292573088744f7985bfdb0bf1705001b1e86b. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/GB8KE2503652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f9dca6a74682aa730e6e87d5796dbfbdf435907bdeb63b56e434943601a35e. 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/GB8KE2503653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c43c36d8efbe9699629cc0fcfbf5fa140b3ec9f9a4570b5fee32682c7291c5. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/GB8KE2503654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531e1f755c01e886f8d918b19641a562a77d4e04e2a7ec400819e14078c065a8. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GB8KE2503655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa38a29fd2849d103ba6d7a5b4c02a19143a0f0743fa1b8413fb109bae4c9ab6. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/GB8KE2503656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dde9f6eeddaa1e8add885dff9bdaf0e6c542f6efc35bd55186ef07411d4cd12. 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/GB8KE2503657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b33b0b0c29e85318bbc5c4ed3b9e826220817ff2559bdfb02bfc5c7db3b979a. 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/GB8KE2503658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19aa60d52349219dd69f95002a1bd78e6dad48994b9dce8e032bdfbb11ba455. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/GB8KE2515380.