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 0x534d18b258a29911b9c0217b44d93d946fcfb38a260feded2a57273ada4a6f77. 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/caa31ad8-e110-4aac-b162-fdf1e9a39acb.json and https://artists.proofprofile.net/proofs/artist/caa31ad8-e110-4aac-b162-fdf1e9a39acb.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 0x211f007416e9a9c215ad04f502013054205a12ced7f9ecdcd238ca14629db861. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCABB1188841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2490726d8e39093d334ba6527ea7a566c8c1daa932430a3d9bc62eb434eb0fc4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ4JJ1747697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e76cfdc3fe1ef0253578d0d007709e5e0de80d964cfc7c83a56b4b75b98e631. 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/QZ4JJ1747702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf66f444e773379038954c1908d3f815cb7e9628349ec9bbef52a2b2bf2a946. 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/SEYOK1763798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d6ee7e4bdbfd1e1c520086286144bdebdbdb330c00461993af2c3183356905. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/SEYOK1763804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff8dbe40b0a8719061dd543a86976dc1b4fb3020f783e1e21e0f11eaf955977. 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/CH6541951625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa3a5f20e95531f7653ea1e1e7e6b3e7db9fc48e3e002143fb443790abfb1b4. 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/CH6542006986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2522bde764dcc0b56189d1c9883b6fb9a573dc103217ac8b6403f9c56c7d2b7f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES82094629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cb4a4b499e640e83cbcf44c6d3df4046942e3a7a3dda263a0ad0e774620bbb. 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/CH6541633278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04defe9c4bfaf9f8045bad483f6240bf67215c84d6ae606064ef189f29b50ee0. 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/CH6542077182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b62472cf89900ada6c59975ae63ee27f7b7e0507ed4fe96e459bf763e679d4. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CH6541633280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ced7ad0b313dcced51ea650ba53902262a29832e9345112a059e5d2aa407c64. 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/QM3DF2184543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e18d8eb1881f4ae23edf1824bdcd6cdfa96a51b3c48292d3350dbccf8dd444. 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/QZHNC2387845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec17b531df528ced63330221abde27c3f7712cb362dbceb92d90faf23cf318b. 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/QM3DF2216528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c4f23059b8e0d1b78e29f94aaada52495c4f79ed82c18745209dd75b5fbd75. 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/USANG2418833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee1736ae801a9b922df123a4b3523cf36cd3c7c6011f1d085183da1a5e91249. 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/TCJPK2532110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8afeba4033b045fe74c74ab0c7ad944ec80b30543e5acc7dbffd912f20e4da. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QM24S1820729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929a739846271b3cb4fb39972287f5431bc806cd929df34c41ede5e486155834. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/US3DF2475458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd164b4d5bf6c25feac700db1f388063c9197944e76be6c2e08d0f4603ec0b1b. 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/TCACP1614726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a50e8d702862ec4049fa09be240669cb7df00211cf86e981072a7d6569f9cc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM24S1802977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a34f02567f33516b6364942e340c2cd7e6bf7a04dc6de53b48a7ed25ec566c. 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/QM2PV1835329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3c69aa2b3b1a061736475529afbb3796c431c6b07881bec0da676922721185. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEQ022380580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46aa91b59631e05fe8a41df77b8d2c33a706e42e0f0f3787f6097b0169c31f4a. 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/DEQ022380913.