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 0x4e528000ea66bf88c88927a4ab295b5bf51992a14251aecf2bd60b77b7bd9728. 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/7d7ddfd5-8415-4a00-825b-b8e34c7bb094.json and https://artists.proofprofile.net/proofs/artist/7d7ddfd5-8415-4a00-825b-b8e34c7bb094.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 0xb960132a3647cfd4e1d2559461cc8c9699a48febb28ba21407fdbecda9010fe7. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USL4Q2221572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606fe25a799b464b1916e4b14f29ccb2c92b6c8acec267ac17a87c741272a6a9. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USL4Q2221573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde923d8b8b4e2eaae3c78d59f8cbf3dc8ab620d9277c7472c399156d7a442352. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USL4Q2221574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505f1963f39c908d67fad82afa1945399a2b8bd83db8555aed396bc0aab83ee1. 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/USL4Q2221575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbc815f4289bda1e2bc76ecdcf6336395d332f0d4b774f72c69d36fdb2f1966. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USL4Q2221576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc044ca1199195c7b6b6c7b502cb2964ab601d301b12f56ff7f909ccb76edf0e0. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USMH92384174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfd2093fb155111fb47c778b4aa016d30902561b256716ed2ee03cc8543a793. 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/USMH92384175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebc3dc2ed5dca7502a2fbcd8fa57794c745c152368e6cda978e9ba6e1f1af9c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USMH92384176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9326b161ecad30ab1c05a1b01074d181a55c8caf3f775400e452636f122c946. 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/USMH92384177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f07b13a8e0baae3f7bcad52b6fc4515a5c8ef0a00dbe3921bf570ac820c2db. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USMH92384178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f578cc484c8282c5c0d8bf3d38c4c0090e1fd45626d939cfb46dd26d67cc89. 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/USHM82483998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51291f51d531c674cd3fb0a0055222c62c592fcf980a9475f2797f56de174c0. 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/USHM82483999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81725b5063c889cb06f9d2003f2cb172500ee12cd04c9978b51a7638da819bf. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USHM82484000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f9feb76e1150eaa803d3a47f3c86bc4c783760622e038b168fb16784afbd28. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/USHM82484001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658e2ab3089377b23460066bf6d9f2a37b179f4d41663c4e86ea08a6f0fe5092. 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/USHM82484002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989f314089fd6fac174a1dada1b470713656a3e162a1055178086b11cbb9485f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USY242495476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e3b5e485ed49e72558be81a299f65a69c91ae0168b718557ef28486f9f3370. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USY242495477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20a5f6af0ed031b2007ae6d8e7201e5ce1cb7c71e0d08fb828c09872efa9791. 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/USY242495478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671930c262796ef63f31fbb3d0b85be24372bb8fc77dd828adf977f129e8835f. 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/USY242495479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f14d132c23793b7202404d4636eab9119cff925b4c4d9137b3d52c644ba2f4. 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/USY242495480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2091e672c5b0e9bfbfd8a8d8f8060c0e155daee5604bf3561e725ab78c650084. 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/USY242495481.