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 0x85924506a23700a6d8f671d82191785a8b2bc4947be5b7bc478ff157d34e48d1. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d13d1c83-8669-4f52-89de-7a7508d31962.json and https://artists.proofprofile.net/proofs/artist/d13d1c83-8669-4f52-89de-7a7508d31962.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 0x80c5b2dc00b45051b047e0c9ce26e878d9d98e25b88f40dae68a926a1adc3f2c. 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/TWA532101219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28c729052d632fec31dbfdceaeaa23b9958343c9442d334e3bc8d06553818c0. 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/TWA532101227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e58120d81929884ff6f25539e6a28155c58833f51758ad9987f46dcf8ea9bc. 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/TWA532101228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf5ae44533bf1ac495a09d72d56ec993175041e5d006fd99e085168cf3abe47. 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/TWA532101229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15433927741c9b1b2b13485415b3c89856bdb789296827b69a71b62e286c6ac0. 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/TWA532101230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b97ec9a8f29031cfb6df77da0ab39683e7f3b83c5e5b43f287900bbe289f7b9. 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/TWA532101233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40f02eaea446e2e1829ee438e42e5f497c6bf8813c6579694298a55f8f27c15. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWP012120411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a488dd77801d5f1f3c114fd470697978eeb6583f0edc9cffc3f90d0616eda5. 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/TWA532101380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd407f10b1dfe23e75ec9a059df323a81d0150f88423e397c66e5b1e6919c0cdf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TWA532101381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596a777ee1c2cb2296d48cb03c7832cd30f94f87029d02b69b312981066ff6fe. 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/TWA532101290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac35cc47c21980f44cc9a5437b49c1c60c0041def4b824bfe7f47fb8a739444. 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/TWA532101298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc813333a095ed6cbcfa6f9d0afc1f42d2e6c7b8c2127b7e15586fd9b88a095. 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/TWA532101299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccc2ac7cc65fe73729a17dbdd82da98432ddb49caabb66e74e733ed92f489a4. 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/TWA532101303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87846e0d15092bd6f278c611902cd2afba8b0aa0db162e4f87bdf70e3ef2940f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DGA0H2357291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e30ae5739ef5281abae79bc4b8d06070bd54a611226968ce994b702e87f5af. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:05:54Z), 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/TWCC32420718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed545faed5d5c7e42bf43f4a558dd5c76cc0cc8874dc470c2ab805b2c0f2e71. 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/TWCC32321688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e8ac2e56cebb738c1f0c82170509880f05ad37eb7acb7660d38b77e27676c8. 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/TWCC32308719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40770d3bf41974861aebc90a2fe36b624f0008b6b640503f28abeceecb069520. 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/TWCC32305447.