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 0xcc74dad4518866688f47c960b92b1e90905ffa50826aed17e7f3e85b3bdec025. 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/f7254263-9eb2-4a3e-9e88-5ed5a3b33c1e.json and https://artists.proofprofile.net/proofs/artist/f7254263-9eb2-4a3e-9e88-5ed5a3b33c1e.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 0xc839129abc551ebfb102370e2ff76f1c32bab38c0e38ee8f6b9e9970852824d6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6H2382177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e84287ad85cc82368757a0cca975452e74f24df22ce535ea41667b0c2fb33d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZK6H2382178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789ee861b97abe2e17c9f71e2b081ecc58b153527c75364b5683bdb60ceaaaf0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZK6H2382179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a127f56eefd7d3c85f0d2e02dd668a882910bcca9c3c77240de03e87b6dcb1. 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/QZK6H2382180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2347bd30956ab44822fb01001bf4c18d35965b4df44b79cc613daf000621ba89. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6H2382181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb0c0911f73bb30643bf75733ef86373876bc96aba6d8fbf5a8e5163d56cf98. 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/QZK6H2382183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb3fa9721292bcd8d6ce6a9ba92be220186c081af0e07f69f09609f8e86f82f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6H2382184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea162b36608fdd500d8b91bbed8f1ad5e5ba29efaf62c1ac977ec1cc757771ff. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZHN52442174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34247bcc65b58d01ff75b79015655da5776e298d9a2c0be76e3f4320965e0e67. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6H2401716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17f17796fd8d74416d6321ee297421e4f2c4713467a15b9ddf0a1ba9f872243. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZK6H2401717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2477a5ca3bad9a3600b44ed52b72ae8a4d51de8a2347c2d2ba7db50f284e87. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6H2401718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bf480c5b5ccedd2b360d5c840d6398ea4d6de6a39a6fde0b473ff3f2ff4ce0. 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/QZK6H2446247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac36640c904a4051138d0982076aee7e57980828e4a87e20f735898bf6d0f08. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6H2401720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea162b36608fdd500d8b91bbed8f1ad5e5ba29efaf62c1ac977ec1cc757771ff. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHN52442174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8789936f881ba6411b3d4e53ee3e8d046b31d73646652e8761431ac0fcf89d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZK6H2401721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd597c69329085f18b76185873b808446f9164d5c3ba178b8a4ebd2f382ff114e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6H2401722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a829d9f62e0a83cc516f06e477081400e0ccce7d3fb8887c9367c4c56de8110. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZK6H2401723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd86f610685c0d29a23fba48229fc64d6b60d32c0fb70ec6c1522184c5a968f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6H2401724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb54bf6fc6f7de555643ffda4513d2403a9f48c2fae834dab80c02a7200ec758. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6H2401725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5e64afa7da55b11da35d3751b1316b3ec271ccf6ca390bf3a4e4b28581a4af. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFS2426007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb6057fdfe27b90963625222a3c309b79ecfa14022457659903571f49529623. 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/QZZ7L2452660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb6057fdfe27b90963625222a3c309b79ecfa14022457659903571f49529623. 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/QZZ7L2452660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec52dbd42ac0cb559f4c9c3ddeadc997af892207860b02eea0af8834d1ae46df. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZTBF2389509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f784034a9d6b8c23151f4f71eb28ff9ec172d7ccf28a77a880e171f5199678. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZZ7R2482947.