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 0x2d846aeb3c61977b769f10ab7def180a79f8ba8bac3bd773ceb785f209883e0e. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81fed421-aae1-4869-aceb-766a00e2d7a7.json and https://artists.proofprofile.net/proofs/artist/81fed421-aae1-4869-aceb-766a00e2d7a7.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 0x3f6bfc609e4884350cdcb55c616936454666bd4c0b6a0590130e9d61dd066691. 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/PLF242211592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2750314b8775fe56aeb963ef743b96c58da6deae4acc98b937513739ee113426. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/PLF242412223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448b287ca8ff3cd848c75d4ad5de602dbdfb39edc046e6dbf286fe17fbbe38bb. 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/PLF242412292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a5e7b718c671b212db773dad6ee08e5bc9b965978c420ede9e4d0cb0e5a0dc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/PLF242411874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3151c82b392037ba7f03da1bc5753e418e1c9ad7ff40649c6242b7e51074113. 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/PLF242413295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84331be1436d1fd2e098928f40695e99d610674f6cf32a42cff59603cb930ac. 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/PLF242413406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39eb89bef91e5e325f13e27378beb4a28fb36d8f45f347d629041fc54bc2ac33. 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/PLF242413407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb487b5c143ada128699bf591bb2d80e9b48beedb39c52211d1dae0d82500eb9. 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/PLF242211677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bc2fe601d7c71eca5b2928355e496f7a948ab257f72c5118baee0251184ea4. 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/PLF242413410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2750314b8775fe56aeb963ef743b96c58da6deae4acc98b937513739ee113426. 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/PLF242412223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448b287ca8ff3cd848c75d4ad5de602dbdfb39edc046e6dbf286fe17fbbe38bb. 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/PLF242412292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f0b721269d99cf58148c43f9294a457c78d6b404ee75dfbb56be9d33a75fbe. 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/PLF242413294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe085018110854024ad237208b33d1f6710ad21da7a437f59bc5fcb8c78fd005. 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/PLF242514249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44a263897826e7b640c2458e9d9393635d9a979cd356bf076f145c787c42b1d. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLF242209582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155bf075034b7388ad25246f7e463d43c79a3b9db6b993450a095f7833291516. 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/PLF242208917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9705a8e92981d51af99eb0254f269e2ce3aca599b030475d93da6d0ae52bdea4. 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/PLF242209691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fd5537289d522e29e43f2140807090f2e05749d8e1059e9c4ee716894ef41f. 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/GBWUL1902209.