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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 0x20110541b8f064d506c63f22d51372cc09db6f3e3ca8e8dc810fc4bddf2dbdd2. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e391515-3430-4ba8-b3b0-34fab694ab49.json and https://artists.proofprofile.net/proofs/artist/2e391515-3430-4ba8-b3b0-34fab694ab49.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 0xb2e2a82794dbf92573b01bdecd84d3f47e3168df9c6774adecc2421188185d86. 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/QMWZB1510905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c64a44de077d057d9a59a9968f955ea0257996e48f90cd5ea8cce3567d8cca7. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/CA6D21600161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8fade9dd785070a5a0a0349acb805b23d3a9de48c096e0a774028db7f67b98. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CA6D21600214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2ebe784fb6eeb6b2fbdebcc83b691893513787a6f13d183f89184b44a09601. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/CA6D21700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c55c9ef2be67ee3a54bf65f6ca081bc2f77cc687cafbcbed11d382fdc9c950f. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/CA6D21700221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c52950607b32502ce0b9003fd6b53889a03182c5b0e7c114db529a265045eda. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CA5KR2030038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557441c1cb25785227b78c41948cfb5b83374c05f071a4d5c8beab03322a86bd. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAFE2032403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ba34390a7b8636eb0cb20ca9cdfbbb09966be6f75563d5dad59d62d7ca6ed6. 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/CA6D22300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec953f63dc2aef75a13c9004bfe1ada1badd216fee142ec8e50aa1b642b63cd5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA6D22400708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8cc89dd084bb3c28b132e3eb0048f11d89a37fd9d74f0dc24bac1b92b0b5fb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CA5KR2113993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8cc89dd084bb3c28b132e3eb0048f11d89a37fd9d74f0dc24bac1b92b0b5fb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2113993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2ebe784fb6eeb6b2fbdebcc83b691893513787a6f13d183f89184b44a09601. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/CA6D21700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ba34390a7b8636eb0cb20ca9cdfbbb09966be6f75563d5dad59d62d7ca6ed6. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CA6D22300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c55c9ef2be67ee3a54bf65f6ca081bc2f77cc687cafbcbed11d382fdc9c950f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CA6D21700221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af555e69d075d9597ec89e7c40544829f42e71ac01a14b4bfc56cc2b0db5323. 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/UKU932390063.