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 0x67e83349e5289cde7e91279b562d7e493c39c31a4bc88fe51d5b60532da69472. 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/f7c0144e-6052-4bcc-ba71-8420f513899b.json and https://artists.proofprofile.net/proofs/artist/f7c0144e-6052-4bcc-ba71-8420f513899b.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 0x2233931882a4aa87afc9d1cb5fdfb3ae0943157ad051dad3b869358c5d158cb1. 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/SE6QE2341871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51dfb3e27a6122de4ccca4bf23b71ae7ac763096008547f485fc9ed1b7e5604. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SE6TI2322047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551484672a61364b4b307720b3373a373404d98456c20534166c1157e35a9fa0. 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/SE6XW2354898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0e69d6a12585eec2622b4fbed3c341badd7bf21483fcba674565b79853c7db. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/SE6SA2397124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458fb0314cf3d1f04ad3e2d63abc8ed33d0a3d3177755e6fb2d35ae057d19f27. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SE6SA2329092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5935ced7ffb6d7dd8d7ed0a85b3bcf5349550286e5481fe6069949684c2f6787. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE6TI2304209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51dfb3e27a6122de4ccca4bf23b71ae7ac763096008547f485fc9ed1b7e5604. 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/SE6TI2322047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275c8d10d2d7c2c4f43516f279190011a896c6686a4b6f53a6ed69047560c86d. 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/SE6XW2365405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f395d45af5acff1385bb36a8939501ce14b077926ac944bca02984af9b6615b. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/SE6TI2341032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0e69d6a12585eec2622b4fbed3c341badd7bf21483fcba674565b79853c7db. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/SE6SA2397124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551484672a61364b4b307720b3373a373404d98456c20534166c1157e35a9fa0. 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/SE6XW2354898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6489c0a6bd390758959535d2e395a79b65051af27c9cefc4959bb9b8148239. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/SE6QE2397494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482156ef0030f1b9a7b6fffc40c705f1d8b128b561e32dea277c3ab0278e1720. 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/SE6XY2338413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8c9d87c08edc4b7ee568777f5a8536f343b67b99abfb15e3ebe212a05bc5c7. 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/SE6TI2327751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d14c1e09946e599d4b456adcf177e6f809f2cecc2d40fd68f30eaed0eb19fea. 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/SE6SA2375476.