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 0x1f6d3f4e9a72e60bc2b87ff29a159b30011248624d23336cc087d3cc9f04869c. 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/1a4be7b2-4368-4228-b0ec-504f6753045a.json and https://artists.proofprofile.net/proofs/artist/1a4be7b2-4368-4228-b0ec-504f6753045a.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 0x33ffe1e6fa5e26fe5c58be4c00f97e9909710191540433af251a98b0db3e947e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/BXIV82107065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9b321223ce84aff83bad3c0ae09e4379696715926dc0a1229741c40f12a2f4. 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/BXIV82280989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784db8bf06b7787f0c7e4c2e78be9817e0927498de40dc5af93363231016569e. 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/BC54Y2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c1a7a98d2bef8084f9340c8a2b6c898428e0329d024f34796e8eda68e7b3dc. 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/BC54Y2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ffea435c85ce14874a1c9bc94326a139e5c7cbdba02029c415b2992c98d8a1. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:12:37Z), 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/BC54Y2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee7d6143a0bd45d517f1388da32a3b0dc630354a55bc41fb7f85077a4ed5571. 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/BC54Y2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf95158c10dd413cbca6b91966efd175032fc65c06b3818efa822f9318dfddf. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/BC54Y2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64382e3080220be42891e5d50635a8a5c4c3ce428b0a3e2c72d0399ffc761e1f. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/BC54Y2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de06a6202527fcee7d4e069c675ef26a305557be14aa91aea8adfed68f9f9ca. 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/BC9RK2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb323b47d45e6d6e13a70c21343b292d287f0f803ad1dc2dd108307d1022a998a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/BC9RK2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27478ddc26eee89c34f46243f145129461a6184b3310895e11f2cc2d908d2a2. 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/GXBAV2512826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd224d44e9379bda15d63ddfb4101182f5703c45dd90df35fccdffb053275c3d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GXBAV2567859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0046cc7fc935fd79a486e9b3535746cecf54571456f14d067a83d2235b30c3b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GXBAV2545273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6a6806d4d7c940efdbc1dc88dd6f48c5e1c9d5ed78cf710894833f85c83f67. 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/GXBAV2557448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d075d41fa14fd819cf0723cca79e17f9640b03047e0ecc9b6467da43ed6d89a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GXBAV2593499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82232eef044048808ba4e29051d605490f509f55294b016a861a17661d5c7d4. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BC9RK2500002.