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 0xf09d79f9cd4d10648444a023ea0fbbbe1ab02e13b5113eef6bb38f567a55fe5c. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b94ef5eb-26b2-4afb-82ac-3a2f0dd6aa64.json and https://artists.proofprofile.net/proofs/artist/b94ef5eb-26b2-4afb-82ac-3a2f0dd6aa64.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 0x632e6806b3fbf2dfaf08f8ed113b899ae5bd8cfffe8fe47653bc736d38a48e4c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAS2342971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1212772703bec0de4ea5ecc6827c251486686d62336911eee51a3d65d4974b54. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAZ2307004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6075edce2438ea8ae084a4d696139937255c742dfe34fd6ba8deef22f380a322. 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/QZTB72344143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9d4f8ea5aafca317e7a4a9fc3e6ab23e83a70e8abbe2c7674a192728ee0d3b. 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/QZMEN2121539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2093c92e7300a88875c397c67b64bfe1767ab42eaa47a4c254f2484cebc59389. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZNWU2202749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb180fc1879565bbb1eaf8746b4ccd48f6209abccc7cd5ca4a7d2a620c2b535. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZNWW2370918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bc0514eea427d7865a6fde4c97275019d5e6c3674ff4724610599c1a2b159d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN52059607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b70a1f0c1662e7ec09ed52b83543241f870d4d01c9228ca04986008a0ae464d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB72344147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70170584d624f0e39cd3d87e89b46c4ccc4c8f0588a3e3d58ce64e799e2c916. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTB32297955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2093c92e7300a88875c397c67b64bfe1767ab42eaa47a4c254f2484cebc59389. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNWU2202749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fdf9147813d847ed1bde5b85dff83b4205419dce7712c22ee6078be16eede0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZRP42233847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bc0514eea427d7865a6fde4c97275019d5e6c3674ff4724610599c1a2b159d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN52059607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acb84698659aa874d97f8aabb4aae279ff5bff318efcb7b9e5dbc3c424d47ab. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTAX2477654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6c27422848a1f2b7875cd3712b90ef27226beb14fe514299a2a8b5f2913989. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6L2477290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2b9c9a09523564d0f6e0cdb710cd995d06bfbf868b58b14227d2348f41b078. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA42434806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb095ea178ddb1755755b5e0b52a869ca54d2da25763b632366754e15b80c50a7. 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/QZWFM2342555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa686c27e3b92564629096afc4959c1fc206b3332510ae3b6b69655694fd73dfc. 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/QZHNB2316088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a3d7dc6eafb830474a0dc4efbab4e43b7b557c444d718bc51ac7977823634a. 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/QZES92342437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc265abbd38a5c9f3b6646ea618181da95201f8037bf7238a596bd0a424db6eda. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB92220610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2093c92e7300a88875c397c67b64bfe1767ab42eaa47a4c254f2484cebc59389. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNWU2202749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bf994ababe20cbeb1aff4b2ddbc1d60b5ee88463d8be70ddb6ec80bab15f17. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHNC2292810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23b172c5310e6bf5792e2902416bc0bf77592d5134bb35ca90e65327ff5b685. 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/QZHN52438777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433f17fb5d7fc3f5bbbf75d5629a7f0efed09b08b186442b2b75c3183135845d. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZTB72483805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f5b6e6e6b78a65e280fd7a96a91c967d935091f5229f7bd8ad8a11322c66a2. 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/QZTB72483806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8eb4497d3a64afeb8e8f5ba72664f6675f69e87f5b6ccbd14cdce735516284a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTB72483815.