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 0xa21f9fc09ddfe1b86be02b2bbfc0babad3f237857178fbc0683cdac559a478e9. 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/140d5059-3dff-406a-a564-6fbc307d3022.json and https://artists.proofprofile.net/proofs/artist/140d5059-3dff-406a-a564-6fbc307d3022.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 0x5711edaa3b5e8b2ced1fab112f9f526c20e30b1fce5c1efa327e043eadbc45ce. 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/QZNMY2238145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8d4ddbcbd08763b2dc6db69d06e4f6eddbae2ad9cae8c7ded4fc679ca3393d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNMY2238142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b2d51523979d5c1568b56610260f557edf38eb7bfd99bf13f175c58698193a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T11:08:35Z), 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/QZMEV2307474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b881986a55a51d8196c59e4daefc46710de62ea61c92b791dd5694d95a7fe75. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZMEV2377334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065ec180fb909be6f06ea2dbeb588523b04d19cb7547804e9c0c4157e0ede0b8. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/QZMEV2398004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64cc1b021d00b2264c73d52390afe2f88534fbd8d360aeaa0042bc5290b67ea. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZNMY2308869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea3958ea20c188ae5a59c4387b14e2cd414736caecc9dda0c625ff78281f73a. 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/QZNN22389911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e77efb4508cb58686b12a1abcf30a9c9acc18bbf1df0e594f5433c49de61f5. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/USLD91757584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0a07808a7fa718c42cbaa6fbc6f045c7dfaee3a6dd7640aac47de1e689b0aa. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USLD91757587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f75549d40435b5a6bba7fdd106507fb1ba872b5e6d7b5a2862380e728526e78. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:06:01Z), 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/USLD91762936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69bbc7c2d936a81e55b9806cecc45dfd8254297c34daf718822f819013c31a6. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USLD91762942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8f4fe4ecda3c28d5a30e9f6b4181dc28877dd550cf582d31512db668541d0a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USLD91768816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da5fc27e7e6f7129d9001b6f1a9b3cc8ff7a3f0c8e06915d40d95b1d0810064. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USLD91768818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2280b3059a3e618a9c2d755a95ffe02555a7b0824967a2cbe6e10fb97abfe3c0. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USLD91768820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640f011fa82d9891dadd7ce861e539eb5b025d1d824e9b6e6b6f13fa47971d25. 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/USLD91768821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba2aad8fd6058aa7f30c7c10c38fc35ac1f4ee12d8c17b60dff86f75a9edfba. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USLD91768822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cfb17ac7bcae6470981e60c07f54454843ef6d88e07e3977ab733dceeb1653. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/USLD91768823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d40e2ec5ec8923c48c494748dc7698de05cbf0e19bf3aac9858eb1f7b423df3. Chain 2 (Bitcoin): anchored in block 957690 (2026-07-12T10:16:40Z), 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/USLD91773492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47054c9a833dd725cc8c8d8b359a8a1f7490edbb34c38aed8fb7f247ff8edb47. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USLD91773510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92063a4660fa195f0cbd6a543916fd4afc1161ace02407ead84473778dc899ec. 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/USLD91773513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cbb12710e284aa97f64042674bbaf2ef181762f1391b8f95b17fe1f0106bdb3. 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/USLD91773514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65f93f798bd99a63c909bcf2ba9a180b99ee15c27b569e703ca4c98bcd4ab4d. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USLD91773517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419079d410af3e11958a4ab73e5ceff0792ceae18517c82402213ef0fa5b298d. 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/USLD91773518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719127288f7c2433dd780061dbbaa051fb27ca8034362f3c93255772bbc8c156. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:03:18Z), 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/USLD91773519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512be1b7f244f3b3e8ef2290e014c78ad34362c95796a72cd9a0bc8ca64a0423. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USLD91777402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83bd0f1371d5cc9f77ee71a9a8632973128d25f3a3a67f982a43ac909503689. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USLD91777405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16738cb554ea4f08f49c2b85b946d8f1518944dd448dbb588d47b7408c1d88b0. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USLD91777406.