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 0x303b1b92aa14cef763d6ae2dde8e93972c2fe817ead45eaebf5ac788c76b2722. 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/ce3faba4-b7e6-4030-bec6-d5ada27f8105.json and https://artists.proofprofile.net/proofs/artist/ce3faba4-b7e6-4030-bec6-d5ada27f8105.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 0x860a58451fbd7ffbd9ef61585746120fa5902b13b5d2186b38168d9b1a000058. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA52315187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0518bde0231ced313bc37154485af21fe6136a4ec47ce65011c71ab76e0e220. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QMDA72327141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f46fc37b685503bdc90c103e9f3af07b6c73d999150e93d67a21403630861b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QMDA72327143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b8fb1b1dd98b9b3eea937fde2b46096ac616ff414d9b777049cc7681e30dca. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QMDA72327146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c81131cd57681960683763ebef9a20c4c43cbab83db59b3a1b55a64cec2be9. 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/QMFME2305899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2ddefef888d22ebe4fb795bfd12b60ec32908d60710e4c620b8068b78b3985. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM4TW2466823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc247def03957b7d23a448d7c0fb78be84894897009124bc59b1058e9467dd0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TW2466824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b765d531758afcbb005ed471ec3bc41eae4830f6f68a48d822a0ebbac13554. 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/QM4TW2466878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16985872288daf90cd1c79cda9376cadf85c2c33ad08640c5089f965b08d2b5. 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/QM4TX2437095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3652a504447d2cf7295695ba05c9f40622c381016fe45ab7139e5a01b6a105fc. 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/QM6P42405998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212be6967543a7feb7ac05aca1c3a7babb776b2ce755f029f68c3bb6729742a3. 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/QM6P42429802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd547bb9b6e87962258ee6f26097b2b9a65c45da68e2df741335b4ba8bed25d. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/AUMEV2355334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ee022aa8c9b3884099b2201e05bbd139e957a2d3ba2c0a7c7c785251827abb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6N2245313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc647116e078a0998a9412b11752e8d489d8eef18d50a3b392a3625dea8512ea. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZK6N2245317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf832b3430798729cea6ee199123fb7fb97ac7d454b42b1c387b3a07df1698d6. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/GBMA22350733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504c4f94c48f4d3bbe106beae2aacab1a28c2fd99d402583ee7359a466c5cbb0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES5152401274.