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 0xc75a1d24bbbdcd024c11d4e8d5031cd341764ce8a6bcd78241916b40ee1729c2. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e229663-3e3a-4070-b00f-aeb789d87f9f.json and https://artists.proofprofile.net/proofs/artist/8e229663-3e3a-4070-b00f-aeb789d87f9f.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 0x2f42b53ebc4d3960aa57123d5dab4581a01656b385281aa4bfbccad35008aa3a. 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/ART0G1803174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7d14b5ef8a97f612b37964e66524265b6aeacebb72e0d663aa5cfad24f47e1. 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/ART0G1803175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14e3b86ffb00f417be0a49c3672c3e03d30b0c29c586716088ba881635e8e44. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/ART0G1803176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68ede47a32f3947e24472a2b96c12e16d36fde6c6e5b3b9be309b189b3225e9. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/ART0G1803177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6305a829ae78199af91dc7440c3fc7fa7a75fae11a18a5133305865b8c4899. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ART0G1803178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33924c8c76cda49094a99392808d6de83310cbb58ab4765b8a64d9127b4cdc70. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ART0G1803182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6e2e60fc95f9fa2b2f6a59b31b8bdcca034ebd78dc41752a8a11f8c34cb04c. 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/ART0G1803173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f42b53ebc4d3960aa57123d5dab4581a01656b385281aa4bfbccad35008aa3a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ART0G1803174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7d14b5ef8a97f612b37964e66524265b6aeacebb72e0d663aa5cfad24f47e1. 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/ART0G1803175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68ede47a32f3947e24472a2b96c12e16d36fde6c6e5b3b9be309b189b3225e9. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ART0G1803177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6305a829ae78199af91dc7440c3fc7fa7a75fae11a18a5133305865b8c4899. 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/ART0G1803178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33924c8c76cda49094a99392808d6de83310cbb58ab4765b8a64d9127b4cdc70. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ART0G1803182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cb17f8fe544d239f6dd37ab0f8cc62e29fa8025e4cafbeaef9c26859da0e00. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UKR6V2342694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e51d9465fde849165a797ad4b5673b4a2fab99fa0e3c49a40a7fd79eca643e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/UKR6V2342707.