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 0xf9b44da57d35ffb24d091efc72c0cb216909caeab030adce77f488fcddb7c5bd. 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/d7f6b5ec-7136-403e-a8c7-66a0512bb9be.json and https://artists.proofprofile.net/proofs/artist/d7f6b5ec-7136-403e-a8c7-66a0512bb9be.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 0xdc1ec2262f9f4371d703e3b97734bbd62413619d86d29765e5f1398e7b660f28. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/HUA611601635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02707a3526c93b9a2aeeb3ca7a01ddd68b55071c63f83fb266bbbbf5f60705ef. 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/HUA611702543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88616a8611864cc360d732859286990c236e616db7e285446b823dbfdb062d01. 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/HUA611702555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13188318cbe3cd58a4800273223cfcbfab4ce04a626535fd9e797e38d7e283fa. 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/HUA611702556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf29f21237da1c41d6c3ab5896a9c241ff5bc6cbe506999c5559868fa51e6667. 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/HUA611702560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabaa10ea1815d4b325bea6e43a0cb3ee4958e07ed82278fccd540cf52db6cbec. 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/HUA612021598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838ffafb65a2029e72b8fa01888aea9a1353e9d0b9ca1d3811319029b3b654f3. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/HUA612022390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e52342f019a0cac753defe95735ceaf8285473013b83ffa4fd69c47bbe64fcb. 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/HUA612200498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b7efa88b62bed9de9e9a8d70b09044b53f45f1aa90450533875600c9c80a1d. 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/HUA792000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f01207c35dbb85b981012074756305f6789ec36a8330b09fbc739e0b53696d6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HUA792100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c70242073036ed1a910de467d608a75b3d381ff9fc7c73d0a4b306486a8e7a1. 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/HUAMV1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a560dfa89af251bb6b668dfe199ab2c23ddcf9f4902bc53f4d61db6554212a. 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/HUA791900088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91877e2eca1795e8e00c737b2ee5c2d60673abf52486a86cd9c72d6e62d0922d. 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/HUA792000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3359b52af28d74bf08d18ef3d1958c972a015af727e961de1f6aee7aff4195b8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HUA791900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f80f525ef1eb8d15ebc6f3b46cb3a4f525ac0431b7103de0fb05380b39a33c. 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/HUA791700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5f94e4774d32ed17190baf1492be60ae171a857f2461ebaee907ef72755cd4. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/HUA791400857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20cf7d2fe2900595aa04dedd2f36e37e2e391b0080c80ecd3e8979a3a1377ce. 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/HUA791100386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f0f1ff07929052763019dffa6998e0e748ba7048c1c2c5ed01ef8ba65228b2. 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/QZHN82192248.