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 0xf7edb51fa5acb2ff69aa629635a33bb93c2711b48ef3e3f3eb0a1224d8e1e6bb. 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/95fad4ca-509c-4f9b-9488-8b711722b8ec.json and https://artists.proofprofile.net/proofs/artist/95fad4ca-509c-4f9b-9488-8b711722b8ec.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 0x4ed5d45e82125c08f6585c4b412e5c4b63f92f91f6d45ddd4b219bcb616abe4d. 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/QZK6F2431330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909f7207fda68407a07fcdf7685c9c184ae4fb15c5257fa9d801c7c7ce7e197f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBC2304011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff3b892d2bc9758f56793f8f0815fdeacd712cf80a56aba29451287fa52de12. 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/QZNWS2406219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e608780c2078dd02cd8e6bb8b797bb6d185aac0eba6e6619cfb0aef93fe92d0. 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/QZNWW2472204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e608780c2078dd02cd8e6bb8b797bb6d185aac0eba6e6619cfb0aef93fe92d0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWW2472204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff3b892d2bc9758f56793f8f0815fdeacd712cf80a56aba29451287fa52de12. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZNWS2406219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2426dc170617bbf1416ab1d07d210b08fa81dd688254869cbb0a807f88273c4. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZWFW2425111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ad0faa79c424fd8e09509ac780b5df2d5048733c69803cc63b7ad7c09718af. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZZ782495592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcfbf1509d2abff75c59adfccd82c2e4025d0b097be923179299e208b264cac. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZZ7T2417623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ad0faa79c424fd8e09509ac780b5df2d5048733c69803cc63b7ad7c09718af. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZZ782495592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2426dc170617bbf1416ab1d07d210b08fa81dd688254869cbb0a807f88273c4. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZWFW2425111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72f625ed7e082dc69621825c8459ce42f8d8c584e062b467c63fa15fd9b7dbd. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QT3F22466395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e322a2ae6a541d49c0435a9dd8436dae6895f6b5f1fa0e3cc79a22d9e09739. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHNA2513099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d0efebb65a16bc0fd58fd2fb1c5a0afc3a0a3770c0d06ab19807635287aea3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB62573169.