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 0xd9dfc715b15b0112f1f76bbcdf4695056131b2f080efd747ff3c611d8181e4d8. 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/fbddaaa5-2cd9-4a16-965a-c2f6e22b5fae.json and https://artists.proofprofile.net/proofs/artist/fbddaaa5-2cd9-4a16-965a-c2f6e22b5fae.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 0x01544c891dbe7f940b9d663bb37f49e31d9b1e1e7eb7b32105c75e8d728972b4. 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/QZK6M2247536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bcb99922d3bb3ccfff23f1173c567d7280706fdea852083d353309104f7d27. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZTB72284046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f251711ca6cc953b36a6c9b3df4bb0f37e79fd6ecd3361f2cb0fb6d275772d9. 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/QZFZ42313399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4feb96a89f3071f7a3e064ec9428e92e09384ad5a6eb49c53814ce7648709aca. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZTB72376852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ee1c486394086ee7f1748ee2807b8cf8c5a6ac60d8a37d1ae51bfca22c8e2d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTB72376855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0a8d34c0ebbdab2742fc0610cfcc1bfbcd79ed70a80f279f1eb1169b98d905. 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/QZTB72376856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553512ace03ff97afb29c87a402d693226ffe220a858a80a188ead85b837cdae. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTB72376857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b6bc78220c141d17b020fd0b7444e2e72bc731eb1c641695136b33fcc8a1df. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZTB72376859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119938f92af8e7fc06579d1e90751c00de5bbd7ac55723c417a5b86dabfb57eb. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHNA2466493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b09a2c8203d8cd05b36a6761793916e00324af85b88c6b61d5c2f7c0d63cb77. 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/QZNWQ2430374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a67b227423b4bc9bf7aa62ad2405a047dd756d730586ce6d1a53854f7ac361. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTAU2405909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da77b8f5ddb1c6c5c91b50b49b5c3d5d0e894d3cb8641062f6c6f8745255b05. 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/QZZ7M2471792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace0fff4bd46f2d6e3dba05297783248af82d2de8ee1f50ccef022e9704f4ac8. 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/QZZ7M2471794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f4f9c3699032291aa0f278f0195d91d5b7409ec2cd115e746e6705cd8cae31. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZES52544700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf993ff5ca4da13b913f5c8e7eb7ca57144ae7bf8b759312b36471dbd463d74d4. 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/QZTAY2542856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefecf8b02303eded0bdce4d0f0c99654a3f35097915d7aa86a3f033288262106. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFJ2501293.