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 0xc8728f2cc2f234366c785bde646ddc614d5b8a6e28f09e4ee2a0cf7b5f1f2ed2. 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/9a6c8430-0863-4c3a-aa3a-9f22886f92f5.json and https://artists.proofprofile.net/proofs/artist/9a6c8430-0863-4c3a-aa3a-9f22886f92f5.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 0x98d6040dfd374e9fc116c3498dfaf5f8f7d472112d506667214535a93d9f7c09. 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/QZMER2354293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c37b520ceaef5399b079699a2dd2dc1a153f629fbf6f6651d4bf8df846eafb1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRU702200287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f810b047e202d6bb9d3afbbc082e127fd42f33d12d95feb6c4b2d2104e56908. 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/GBCFB2301000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef4ff221fd4faaec1ff835d8bd22068166dd9dce660ad1432429823c88c8a8a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBCFB2301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd2c119edffc7423487e8871fb39fa90c88698470503a2c582daffe37064e41. 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/GBCFB2301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9112b323a5cf21e7ab64413178f91870da4dbfb111204926c0a248b6f2baee4. 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/GBCFB2301003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe97edcffdde2c76be55ecf91b545130b772c65a2b0e386c077370b11315fd8. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBCFB2300867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af1dd604623bcffc7e7a5b7811e3cc0ca0dda83b80d354feed470ca3797d23. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/GBCFB2301004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72316c7d9586748408ac49789a4b8ef4b6d6e9086532b4456f34384ed1fd5391. 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/UKCNZ2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf293f08db6a0414d42b9c11d51dc4f3593a5401038c3bf15002cbba4449f5ca3. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/UKCNZ2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a98642ab4a8a51f0f875d10a6e9eebfa3d2ff3e313489aa6b9e1134201af01. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKCNZ2400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48af1dd604623bcffc7e7a5b7811e3cc0ca0dda83b80d354feed470ca3797d23. 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/GBCFB2301004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef4ff221fd4faaec1ff835d8bd22068166dd9dce660ad1432429823c88c8a8a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBCFB2301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe97edcffdde2c76be55ecf91b545130b772c65a2b0e386c077370b11315fd8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBCFB2300867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc13a3ab7fa121cc03a3ad6efae164690c9189237e77470882bec3fd638343e2. 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/TCAFB2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9beeef4cae696b367a5fa8b2e3c0b3d4653e6bc42d80ceffe801110e4b2aa7a7. 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/TCAFB2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8e622286f40c582ebe19567683d4ce83021487f886474bc5e42a8f4298e6a9. 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/TCAFB2083756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837f36a4b4fb07d3a7cf18ba27d870b2ad3340e32d027e474b131a5f60bd08a3. 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/GB9GM1900013.