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 0xd1e7d2a7797fcc56f26cebb844fa5e9d22b8630764085cb4db76eab4b4ed4ee4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4894c2ad-c87e-4e2d-a41c-04d9fedf982a.json and https://artists.proofprofile.net/proofs/artist/4894c2ad-c87e-4e2d-a41c-04d9fedf982a.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 0x3412b93aa8af9ba805eabc10f29da949e20bdce6873cb370678c14d27997ae47. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/THG010801384.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd42e4e8d6bfe89b6513524d895cfcd173461b83555bf9c174791b13e671817. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/THG010801386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fc7e03d2a0db73d201096227de6d7f4f8125968beca4a314f5d5b560c399e4. 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/THG010801387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e4d2fe7817b31121611a04de5e43207deeacc0e83cc603d9686e105e2ef1fb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/THG010801389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a8752fb023c9ab76567443ca199f6e3e8f89d612db269f1b4c185f0a041497. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/THG010801391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c70d3320e1d74293aa827d777106e0776a9199f3fd802b71c6407a3d482b903. 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/THG010801383.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a2e073616d35d94a48c29c191b8b2c875c59099b19a0418ce4d514a3dde310. 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/THG010801388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a2e073616d35d94a48c29c191b8b2c875c59099b19a0418ce4d514a3dde310. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/THG010801388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a99def9e8cdf7ffe174b4397d17fb90b091f6cbf4918fa816169da33ce16308. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/THG010802024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f87c4f7ce83fa743215ad575e8be31a80a0e1f3107028227d4bd76fe718473. 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/THG010731543.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af5cd67b1e81f340b6ddc93698916ad102016f2390ca8d8247d86cbce1b9779. 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/THG011600398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb014274b7d1e2f790b4dd05101edb653fc5de3c8a53efbbd24ebfaa658107565. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/THG010806810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaab2030b87a6d840ced120a4c9cd7970428f953237e8aeb53f3728071bc6ad6. 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/NL2J92509768.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd76c706c16a103d844de036a724c21ca077c9286b64ea691a8e60a002daacd. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITC941820078.