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 0xb2cd4a3fbbef3ee4b142fd03a8187e08c3a26a85be83be39be495e4d74448ad1. 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/0f92f9a2-66e4-4d86-8e2a-c6404a3d5fa7.json and https://artists.proofprofile.net/proofs/artist/0f92f9a2-66e4-4d86-8e2a-c6404a3d5fa7.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 0xe24cb05e5e91239c6a69178e4fbd17c0cd64e051ae079b1c8ceaccc286fb5f91. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWV2009446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615168f282a3b5308e17c63158d289526996f66312a4cfd31d9d2ba0afb6f104. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZHNB1972172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235e4045faf8afe15635ff0f060758039c2f47c75f52cd4de33220331ad2b1dd. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZHNB1972177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915c1a9c2a9bd8333312b3353a2c24809a3e43208ce755b3c8748aed2d6a6ff4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6Q1993977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc78c8febe206dedf0617483f7dcad94423535f0d6cb8892e060fee3796d35b. 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/QZK6N1903580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51dffcc909afd90a2d271dee63cc472754b0d1b2c9bfc740a94fd8a5aa24164f. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/USHM92012119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec14b06ae294cc1c9c257e3f56bc58fc10604f3a53850d1b2aa7dd7c1ce93d75. 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/QZNWV2009448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6475c6c90c209f4a7ae8d405329080be7e09f2396949fe5675a2e965f4fcc2e3. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFZ42325933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f41f70f62194c2015217a7df6fb141aa1ad9e7ffe7aa0aa187663105062c299. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZMEM2313045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafe1395f00294363cdfb89751d5f1f472be122b41ee691c48eea12b1d796340. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZDA42002640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09192c5c21717f5a638918522bc36af6d795b3dcee9ca56f3f42a19049fa20c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN92499925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa2726039544367b31464e9c299faea4affbe24c234bd6f88d3677461a16693. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6H2454075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2cc4be8281196a29f51161c9c936a9047f88a9aff16201dc5823e62c89d860. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZDA62568818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc299318c87cf680bfaaec14756bc3629f0425fa20f5e59be5ac384190d5bd8fe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6M2533288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aef87e75138f46c84916cb5fe7c576a4135dd086723d35b5d9ba4a0fa33a71. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZNWY2547852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66495dcb32868005d804ac6e2b9bcbc54c2dd6d01710d58c05f1e65d6c19135b. 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/QZZ662315400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478149a0002201cb9d1d408ad1d2200a810082e250c89faa9259323c022aa07e. 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/ZZOPM2228987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b555fc446aba497b3999b1a4445465225c3062a0a2e3e5678efc8ed0a389ee1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNJX2204305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8e8c969590aae2a489ca8000b82c154177377fd895446ae033b49cd5b22592. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZYFZ2380429.