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 0x607729ac9544d968d46e0faeb9f88ee77cb4fe5a657a25cb56bbd496b0ee3435. Chain 2 (Bitcoin): anchored in block 953681 (2026-06-14T19:31:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/64e743dc-3600-4fdb-87d4-d3a565a57ca1.json and https://artists.proofprofile.net/proofs/artist/64e743dc-3600-4fdb-87d4-d3a565a57ca1.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 0x6b25d918aed2bd1ff3ed64a119246b45d98e78197992a434f6395e4e64cb00a2. 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/USDY42154295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef0262d8a15b2cd78920db1e872086a74493f8cfce487e3882cf280d2d2a04b. 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/GBLFP2001769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb403220c8de80b8c1d19e83d5e558cabdcb769d8e148f5db009ca2d236c623. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLFP2095721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49eb17d1bfe16cdae582558d94c87853ec4fbc3b2df526dc68f4b298267142b4. 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/GBLFP2153661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e40fb04908f3d7e0dea47a46da873bb3e8c689d38654a51a619a2d0ea0ac92e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLFP2153690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3815f40dc32c2c4d0c9f2be80b18ea0ec48f9c9353afeeed7cfac4ab6a4ea19b. 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/GBY711530132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456e11ba31a8b22d92cf3537bc2463336a21cfa19c24575204b9184707c99d17. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GBY711530133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680b1cfef18946091922a53fdae3d183a4a831195e7a8a84b35cbd8b6aa12227. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBY711530139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cebd60692247a466bbb9afd09d69abdbf0fba23699ecc0e9e964a1cd96a011d. 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/GBY711530141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d984eb6020c22080d723d7021a6c87085ee9d8ac0c0691cd2f6dbeccd1e5b31. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBLFP2395561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf853b0af50af178e10db45ec44a0955e562271cfa5d2191213ea3bdad3e4b5b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLFP1918534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddc661d7561d7e80d32aeb5d8c302d179a53944d15a3477d236204d491588e0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBY711530300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f56e1c00052122206edf12549c7a768f2c8cef3eb08064a8eb861af4768b72. 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/GBY711530304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd96b4e6545f08a25f82b991d8055a44fcd19bf4db6ff299f6c79c0d7f3db9bf. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBKQU2410991.