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 0x661b9a937faf75ee4fca1c35f0cca972f5b30800b3b8ecda84505986fca63221. 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/db13e614-87f9-48b2-95a2-4747100156df.json and https://artists.proofprofile.net/proofs/artist/db13e614-87f9-48b2-95a2-4747100156df.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 0x0be5af212e1121ae6798af7dca669b4a7714591c162af81098a9fa554bd7b77a. 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/DGA062044589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7302c9ffd928262643cb53b9922d435f951bfba6f996dd8aef06fad55bdc470e. 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/DGA062044590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0cf42ae81f87902c42c880cf91c5c05afed9ebef0697511431ff9c64388799. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FRX201937621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb14df09f8b55f52619e4b4c80b7500edea69bde0394b37abc139ca521658841. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/FR2X42343127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086398755548d9a2e804853d852e5101c48af3acff256c526fecfee6fcd57bed. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DGA092336045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161ae11c583ca32c215a44081ccfb6b2df3122fcd141693b9c98ff119a6cd943. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FRX452433638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc940a1ca98b49e6fcd3af05de4012625004b2b1fd24bfbae7bd30375b4e152. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FR2X42548876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb14df09f8b55f52619e4b4c80b7500edea69bde0394b37abc139ca521658841. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/FR2X42343127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161ae11c583ca32c215a44081ccfb6b2df3122fcd141693b9c98ff119a6cd943. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/FRX452433638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086398755548d9a2e804853d852e5101c48af3acff256c526fecfee6fcd57bed. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DGA092336045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd0ba6d6d2e51bb8f3cae31c673bf0ce760189bc89be254493b75b612ac5ba3. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FR2X42548877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7f4787f0c30694de2933da1ef1621b2af4b9f04ff5571ea2980aaf148108b4. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/FR2X42548878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda311b808aac66b700a356584466236d15de05a93bd6f5d1104206366e814114. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FR2X42548879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf707ccb068cbf348bb03c98157b1448dbd4761926ddafb47198d9b78fe973f4a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR2X42548880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50868f4653a46ecb3f0eb4c87cfb6c8f20e85ef123d05bd899ad72604b2480fc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR2X42548881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ae1b8cfe7cc1704cbbfee64e26736ebdbdce0a52a2b83a46877175292b0eda. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/DGA052300791.