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 0xf82852d223c1db202bd8822b01f3b4ee65611185c8b450ef66a382aa4c5e594a. 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/49d92e79-f3a5-46c6-b1ca-8eb1d0b1fa9c.json and https://artists.proofprofile.net/proofs/artist/49d92e79-f3a5-46c6-b1ca-8eb1d0b1fa9c.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 0x0cfd9b64acdeae70831f945f6d4636c58fb156be2c3dafc7dff3e5cc317c9d31. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QM7282335774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a4406ae222554f5b59e832c81de268a4362295c088fbcc1bd8c797a90f1c3e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM7282335817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5310210f8f68ad07188943b40c897884ee5712b57e20e44b01e8c1dbb1c9e81. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM7282335828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e70c64e141da8bdc492388842a63a2434fefb2573cf9f5839d537e5a44776b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/FR96X2365399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607bef29dc2f2fd834bbbae8a48c9d650ea02b58fee727c0952ab5acf2fd184e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR96X2365401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a053248115651ca43d19f53b924efb000684be3305d788fa859cc9655f0a1dd. 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/FR96X2365410.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f64b62ddb30c81f8fc740820db73f10037357822ee385e8e843670922ce9a4a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FRX282364892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39157b23850a2511b4ca6497a60909452bae88b67820e8a07858b6a35080b198. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FRX282364894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10e4898d35266e875a0c21544ae0db2a7d349e76fd7099a7ecfaea802acc125. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/FRX282364897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4a6fd679c80abcdfbf94b1eca8b8489c0ff4c0cf9cf52383964b726d0e56d0. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/FRX282364898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9616ba66f92c069a08597831c1f2d1a27c2677d188794e6d6f4aecfc69946d9a. 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/FRX282364901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8963cbfdf63d51439e4a28e8e5489096c6a6a836adb0ad7891031066fe6aef28. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FRX202467224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d18802abe5172eb13b2f434aae4f902298f7f6bbf24132019436938e4c0a59. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZZEC2424306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8614fb61fdb9ad8cdb4150f23142381ceae7c23d14423da9e01605b9c09a217a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZEC2424296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc304d637187b2a2d79c28d66506edd2aadca2d1ca82c90d4393843337342c69f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZZEC2431474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4f0a38e9e26ff730273a4156d7b83321452c78f787c63af2409c6b4aac7a52. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/GBRKQ2573338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1407d4cac9fd124a4972b6aaf437a6b0371b64fb5cdfa4f8266e02040c4da6ba. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USLZJ2558971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745ef7e4b59889d3f262c05b7a1a203fd965798e71b686f06e8ae0aa78362b90. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/FR2X42563993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07d037cc80bb5b9c8a6f7668ff9b2406e1862934d87a4fcceb43462fb404c3d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTV32519854.