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 0x2c26845c8844e97abccfe2276876a9249e6c2f8f04def2899c658a977af3d45d. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc23006d-160f-41ba-9239-465e4bf03a23.json and https://artists.proofprofile.net/proofs/artist/cc23006d-160f-41ba-9239-465e4bf03a23.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 0xf90d7fcb0f337d642b3a5fdda8efb08b3d672540cf342baf9a5442a93be0f83b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2227351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96bac9e232334989ba696c89a3811a1cd261c06b3ea08b6781b08e61652220c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2226305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e091bde9611b311bcf0128d0e319b6751b23bc7bce615576109458582a7e17d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2226307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7260da0e5274fa546de7429d55e792609354c371436695f472f758c8aa399e. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:07:44Z), 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/USANG2226310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a130acde94bc7a400e4342a87e2d2ec741d41d390981c769578f3c8c402ba7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMANG2204545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2dcf7c5f3ccff1d8f6950585d4ab136f679553575a6216d942c060dfdfb21b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMANG2204546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda413784b5c486851cceb1e21d4954bb225336d421356dbb45d7be5985a796d0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMANG2204548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56a5cda354b8a4009ecd52ee7eb4b99c3e9a2bf499f21db8899fc94ea60a33d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMANG2204555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba22ca446499f13a377e9691cf08806dc6a1444845581f48a04632db38c5c4b5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM3DF2247150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ad7b768d5a3364a111ce89be32cc1b52ec62fb24f91ddef5a285686f3b465a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM3DF2247154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb126e4ddb408ed6ab7f7633c10875c5d665a68dfb5624191d5d283c3b18f0589. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM3DF2247156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9dedbca8e0174560f18f139e6524bdce990d6c6715c88b23fdea78c4ac8b39. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2226415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5445f68552b197387c5a560348d2fb4447f846ae8de8af0a2e17964df8793f01. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:07:36Z), 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/USANG2235312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae1563205c2c5e68a2f74cff342dd30bb730fe36b73ee5a355f071810900df3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2235315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c425e2f4b58c3d37cf3ec787f3f7054355ad7f492b041c3d8766934ab6303b0. 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/USANG2235316.