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 0xaa729b3bf549298666178323ac4de568db2807418a93c3cc682a76ee73264a35. 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/05b2b5ff-47b3-422b-b391-af2a81070305.json and https://artists.proofprofile.net/proofs/artist/05b2b5ff-47b3-422b-b391-af2a81070305.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 0x67fd0554f00f37c3187599aadb8cf871fe2c1cc5788e5ee9abc308f0cb2119f9. 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/QZDA42455713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b27b5d497c6c17a5c9392a8ccdd09cbd63026582aa912663d507e658b3529c. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZDA42455715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa45f76ab703fab498b632dc6a6dbd38ec54e3fe3a2f82f7c423092b3781dc34. 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/QZDA42455717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281d0da6d518ab7c1b94ad66c408860b27e98d216def031e28ca5c285de14e68. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZDA42455718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf23ed1f60a5ad55bf70d7197c2922d02d74743f0991653ec73e55d1c0dccba. 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/QZDA42455723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cd09fac111dd1db82a175b1711b64969db952d440c25a29c93001f2c7984db. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA42455724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f120f53f8dda590f9b32bb5f4a181a0ccd57c878b8570c65638127a52c2a49a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZDA42455725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92e3e7011ba6b06b99cee5e3d04e065aa7d4a4ac7d2db4dd6bb58f4a6f7dff2. 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/QZDA42455726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d72b0fb1c08413303ad4a131746aa4a4cd9ddc2e623bdbb2bd4b62f6b0e4cb5. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZDA42455728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e1f596ae1a3d1ffbf7394f590001a9d44c7d0056fab8ffe93c83f0c7f5024b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZDA42455729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd901fdcba5efed1bc4827fb398ec68f488de013a599385aa24287c24d8d1a3. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZDA42455731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498e861af79abef0c969225fb8bf1df24e43686e01d5b85f584ebb129382112b. 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/QZDA42455733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2008316012865b533bf2bfb1d4708f7f89f9a9f4b984d7cf38cc0cd89510506f. 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/QZDA42455734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e73d7c0c2d8dde601aad7b5e2dd38dbc9104132a01ad670dfbd0b53271fe4e2. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZDA42455735.