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 0x963577516ce8b8f8d24a41af30e3a00fef447403d0b72767fe99281b034e9e4a. 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/af9bcb2a-6659-4602-bc17-53477213feb3.json and https://artists.proofprofile.net/proofs/artist/af9bcb2a-6659-4602-bc17-53477213feb3.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 0x67823d828830a00b1732e1b1b01f2e00a6d7ac05f009b55019d940fb42a38dea. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZNWU2347774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa4b36fa328fd306aaceb9af21425738146ff29453a8f61670c29d8e7b554dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB52329485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4528e76bc0d7b7ae4409a44de4c5a77d4263b1b89986205a99bacbb3abdfc6d. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBF2351095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e0ecff873053a048ea6a96da0df59064d91fbe451d909004d891d1b1624ed2. 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/QZK6N2431236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a233e064d442611ace5e4c9f109fa974cf3cc15d7acd1ede93a17d170e3e37. 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/QZMEN2465214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fd54be8ce9482914c448b0d12531eef4f1a95dc450174f06c4bc35d6f205ca. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFR2454333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed4d8a1309d583773dce8650dbd9ff48cad71fddd98686a288ccafd21601a84. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFR2458481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e17fb5e233705434dc67a622fb302aefe0be5d7e2a823fd90c6d70ed0534edb. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZFZ42541812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72ce491889f8353d189a0ecd6a1c956f0d10c9f4c232928f0ab0aeb0096fccf. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZPEW2544893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8972d9313ebcf345d158fbf5856061efbe76eb5e3aa4f6ebcc2e8117975f4b7. 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/QZMEM2501428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02151cc5515f3dd5f639c6ac010384c0abe914f078e20d29549e9414b707dc9. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWY2536948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b12263e51019763ec1435037febe3358cc72aa2d355ff459ccaa10181f0a37. 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/QZNWY2536950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bcf53291f0488a8b5676d53f18fabadf884a34b0fcfa07f8394ec962bb766e. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/GBKQU2545654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e3f06bd3f07a2853400818d0bb6988e52bf4b11db8559c8bdc1c1fac9c30f4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GBKQU2552792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506322905b1aca7900a5eb4a4b87f7ce09a74a1955f9b03a651deff81125773b. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZTB32596239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5520980d4bd1a287987a1d267999c3db1a214e349fb6e4fdd4dfdc9360f959f. 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/QT3EZ2590340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d39234511b055a877d6da0f3ed7ddda235fad06f7f9c767c1c60bee42da983. 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/QZFZ32517948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5196aa960dc637fcd078489a03eb4f49e2d8f5cf47ebcaf6d0424899a7d09ee2. 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/QZWFG2435773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa680b0e2249d84501019721b5d90de54ff132d1f0c7b23b58b5b706f4b90f315. 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/QZMEP2412614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e36d1380bccc6052226822772f3968e1410762ad1c4fa66e2b7e5243142774. 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/UKEX32500334.