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 0x0279a315e3462ffb472828b9f4c83c54ed39bbf01cef9023bdd15af5c46ec7fa. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8605b634-f0c2-42f9-97b4-1e38b5d63efb.json and https://artists.proofprofile.net/proofs/artist/8605b634-f0c2-42f9-97b4-1e38b5d63efb.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 0xbdeb23114df7b51505e7a6dcda679b2e59a31363c98c28ac8b86fe60e4e1155d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZZ7R2474068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99045051f815e01be4112ecec2cebcdce2fd07fe9c504cade747cad77abdf400. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZHNB2508328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bb5c93346dd18de0db1c90aa8325ce2fd64e16fc5bf1abc43502aed23d9536. 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/QZHNA2569817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b7d541a54591ff1ba1cb219f4422ca957cb97dab85808a4ec335767c7f4e92. 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/QZMEN2509527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bb5c93346dd18de0db1c90aa8325ce2fd64e16fc5bf1abc43502aed23d9536. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZHNA2569817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb263cc79b4ea7355e65d7920b768e9b9b7bda141857cc97eb0547f46ccae7f6. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZTAU2577294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6564d42c4b734acc517c70e924acdedc99977081ecd56dcba173b52e6cf3cb6a. 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/QZTB72500514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62503d3ee072afc80eafa657be2e857f397184a77e85047d4d1c9e6b1f88d08. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTB92593478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06a4c8cb35450f724031eb448819e34aeadf2fe8af459d020e2fbd16c1116c3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTBB2583187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf3e4665b5b20b69e22b735077ac18240cce93017dedeac09a4d657f721c7ba. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFH2542126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91bec6fcfc1f074120183eefa4640579724e958f69afe7bc6bd67ba4bd0d77e. 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/QZWFH2550344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5a7ec68fb19173c945a8b91e0f8d2e13857586c16f1aa346062d50423268d2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFQ2568137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cadbabb4fc45d8c7dfe3f0cfbb31e3334d61594271f6d74d928e7991671049. 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/QZZ7Q2568040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51483ee8f8fefd2bcd6ef374cbbb10eb8be846ce457c67a94346473756b445f3. 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/QT6EB2551145.