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 0xdc005cc0b9f23dbdb9cc8e126673d2a2bcd2ae1cc74bde3ec5581547effcd72c. 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/bde072dc-1bee-4dc8-bbec-e6a2f9f268c7.json and https://artists.proofprofile.net/proofs/artist/bde072dc-1bee-4dc8-bbec-e6a2f9f268c7.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 0x5c368c6f140f9fb21d151501b542fa48ff5f5bc7cdc48cce1b62e50fb36af2c2. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR9W12209279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5fa2272e258524a360af260ab039e51696a31d00f9c290752c154ace59f0b5. 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/CA5KR2099380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c368c6f140f9fb21d151501b542fa48ff5f5bc7cdc48cce1b62e50fb36af2c2. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FR9W12209279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5776f5ed397dbe54c42bdeb971cf30478602eafe6f0369525bd1a94d0560de11. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USLZJ1947601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7e5a9beab3d03cd22c2f8ef7d5f11ae31a608b41abb0fc04281355de98d86d. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/CA5KR2099391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5fa2272e258524a360af260ab039e51696a31d00f9c290752c154ace59f0b5. 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/CA5KR2099380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f16ce0f37c14ae061738195f4cff681f43e99a5a054259dcf1218de4f979ff. 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/NLCK42214845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb18b1d70c8035232b0ba92b597b44c117d584c2afce5a7f4129e41ed23de075. 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/CA5KR2245799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb18b1d70c8035232b0ba92b597b44c117d584c2afce5a7f4129e41ed23de075. 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/CA5KR2245799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea60756a7c83f4ca676cb962760757a1f7756599ca1be08b1595571a4dfd0a56. 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/CA5KR2236079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee3be1c91cf5bc8fcead728b38c176d044baea046ae26b595bc6d9c3078afe5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2205041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9871491649956ae01c00721755b43a9814832b7bea93f0a5a1f47f027c9e28f7. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/CA5KR2205044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef18c3ddd91f28a5cf8d1df716324def55ae3e5c533a2977d7d105ef0697d175. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZ5FN1893029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac056a86f6357d98ff0f7fc267219f3e3a5c5859b6b5855befb089da9dc6177. 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/GB7YL2000146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e8bb09c8b92b3bc539896397d55f46e93cd6ca820edfc6aa6073a7db09fee7. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GB7YL1691616.