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 0x728a24579c84611d1d27ae4141cf807ff602080095320e4ae26eeaffeff6cfa1. 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/adb9bfe7-986d-4398-baa7-5ab8e0ee35bb.json and https://artists.proofprofile.net/proofs/artist/adb9bfe7-986d-4398-baa7-5ab8e0ee35bb.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 0xe777d80ccfa1aee4faf5292c79068d82d85ccf34dffc8e1a064a76e8045c09cf. 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/UK6821728859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028aa15f7d7ceb924c2fdec9ffb1792391666e7a77a4bd431104e4c6efc16fb2. 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/UK6821728865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf388b6902f6fce9eba5f327ad5d9a3630e2e07be8478a4c2d3b4a3603236ce1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/UK6821728932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0696784a49e80be4e46793944dccd40c6a9fefe60184e66c839c61a09f92ffca. 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/UK6821728938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228ef5ff8e4d9e69db3d1b8ca917ccd64dea4a143304dd35384a7780bc15405a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/UK6821728876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2f1059e64e6fbe00847aa560af55c3a90a4c1b9620d773b73e86a2ee552038. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UK6821728929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2e7cd2f8a8214109f70503ada0bef2ac52ed94aa5808e9ec1932023f90a638. 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/UK6821728935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f140c2f4792311627e21d19e5f4a27ce59e09f833f8b70fea4c58a097f53b62. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/UK6821728883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b7b6394ede5b64c11aa9b9de09ab8f8eb409e826b6e0cef70d1df9315f44ea. 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/UK6821728864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690870c8e9d47c8c645420c0accec7dbc359e19250cc618fc0f1e222a0e959e2. 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/UK6821728919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4621fa45ec8125cf504373a51d3b646f90f516274e22388cb28239cb8d48c6. 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/UK6821728937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945f9ba4e6e0118fd8917d2673917232426b879b4e21e35c6824328ad46d1741. 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/UK6821728925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8094b9bbed9e3325a757f243f402afe35335255fdd8061ac68857e49ac05463. 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/UK6821728891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb472e5ed99afbaf828d1c9a150683b17ad966a95e6abf1277610479d2b386727. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/UK6821728926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f9ec8d75adfdc6f1ef143b3ad1290e56195e93cd7702796520b9a3382142fb. 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/UK6821728881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8735299f00f52ec9f93103cb2926e4e679ffd402a965bd33c7b6397d39601834. 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/UK6821728863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1c0eb81ecdfcfaf093c0fd5b95079636fc1753d975de584ce2eaab89208dc9. 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/UK6821728866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923fa35f5ada49f3e824419a373a2ed9edb91cdc9feb166bb60057eb5bd280e3. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/UK6821728896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dc996681e2a12350545fce11a57af34b547a5b9defa9624d5f8236c20bd729. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/UK6821728917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d8e326fb224a5a1b671a96b1ec3e61530a182d008b6512c1bb003a3064a3bc. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/UK6821737648.