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 0x8e5062312977da80eeca4cc588d13d73d8cb20ac0bf3b5979b9cf7f034bda7c1. 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/acf3f798-11cd-4450-b5b0-71215c89e050.json and https://artists.proofprofile.net/proofs/artist/acf3f798-11cd-4450-b5b0-71215c89e050.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 0x59d0632e2883ba0ebee6b52f05f1394cbcb078edf66ed6c59a8a30a3b142c80c. 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/QZFYY2424618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9f234b64eaf7a2b85facb01cee36869ec39a46a3e07cbc3c7c03268897d787. 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/QZFYY2424619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581997877ee71eff5482918fca75ec5bdb42c006a7e02916ab3c36f354d6022d. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZFZ72429830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9e053d6f8155a746e22b6de9b7797da5661ec911bc2be6d33a0ac174e5bd31. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ72491340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed492f1f494ba56d0a3c1b8100a0e595b5fa4cd9911da551608a554593664dad. 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/QZNWW2484164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01592e1029bdfcf16387b7d5a1643fcce2a70264360781dc65d9bf0b26e974b1. 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/QZTAT2488425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755da1fafa4ab66c8a4c0acc565bd087ce1bbbf2a9aa07e3eea535d10e1822a4. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZTAT2488426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1c2db66a74e0d1409712525ecad88aa0b38a2aa4d5aa024c6938d60b4fe4af. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZHN72457577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac3ebe06685fb2eeed91c48d716dadad509b2528e6297997e6864590e8be97f. 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/QZNWS2490831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85125c9ed03512e7695bfdd2ffc267cb0cf445050a2705b64991ae7ccd12f4f5. 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/QZTBB2413477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85125c9ed03512e7695bfdd2ffc267cb0cf445050a2705b64991ae7ccd12f4f5. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZTBB2413477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb44afd17b333ca2fa044b562c21016e86b809dffd68116e6d33c2bb0eaf7b30. 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/QZWFE2465081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85125c9ed03512e7695bfdd2ffc267cb0cf445050a2705b64991ae7ccd12f4f5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTBB2413477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaace80194bffb8223f8edb0c0ef28f4739bff38ba2cc279ff0fea1260b71127. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZDA82586706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb44afd17b333ca2fa044b562c21016e86b809dffd68116e6d33c2bb0eaf7b30. 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/QZWFE2465081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d6a83c7ba04e225f0d6f6862ab3c2cfea8997925c39c051c69577d619fb8c0. 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/QZK6J2514861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71012af8627a9d2f9cb8c2e56457b9041f14a60531c4b0a53114126caeddcf1. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZWFH2512454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eafa7a2a66b6f474cd94d5670298b921f088f97666f3efe5dabc63e2ebc1d6d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFE2592962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1c2db66a74e0d1409712525ecad88aa0b38a2aa4d5aa024c6938d60b4fe4af. 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/QZHN72457577.