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 0x278fccf5e33cf36af100adf9c3324e43673ec6abd7c9f2110dcf596c8afeeb8b. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c855f298-23d2-4198-9077-d30502d7e427.json and https://artists.proofprofile.net/proofs/artist/c855f298-23d2-4198-9077-d30502d7e427.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 0x305e060b8a33e95eb2859db4db4cd5c4fddfc4ff03df80d8458a12e2e9d89ad1. 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/USA2P2461216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e9e27a0a398214c3cac340978ced7f684fbd6c3d75cf61a8972410cdc4ec5e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USA2P2459255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7467f8897f0155c730159861499e05594974b8e7d2571d516a8678cf1aa77565. 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/USA2P2450877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e9ee33791b7a094a20f80cd3c00974216ab591824f2579e788b2040c988ad5. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZES52452079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1333a49fd42d32a4bf894746bc89ea43bee9a1f88a36b42a67efe3c9c80ab1c8. 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/USA2P2353967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b40bc4a07d45a009a103791580aabbcf35d256e5692632c931d91944b937c2d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USA2P2340162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29156484497bbe9fe94159615e8f7927536e48de970ac26f177a6df0d8c7368. 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/QZHN52310579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ff0f5244d1c019f6319177adb6462a1bfaa090ca012aef79c1794f48c00bd8. 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/QZES62342925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c070c56ed5dad764a097736f7488f160bb1da6555f6e7b9b858bc3b9911fbc. 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/QZDA72541456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475ba548014316461fab065e04449eb35e2e7501a7dd367070f537689e0d845d. 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/USA2P2468398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e8c4c524503cde21f5840e64ee077b39e731d815f7fd4aafa58cbba70e6fd1. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USA2P2463349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d72ebb92c5cfb0375fc17d3a45c966fa23210aac4d054d20dffeeed85902104. 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/USA2P2438698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef8efd46496bf7c0ab94431d34ad8aacf3a290242ac864101d932ee2391c75f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWS2412902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44eab88631fd9da41563adb16c4b4b2e08fed1779a1a32be156db44bb90fb10a. 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/QZK6L2443361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc6ebf27d23ed146fc886520a8116fcaded4437bed08544f52020422c496714. 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/QZHN92490811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e1425542e1ece5d76c1f245f3f3b30a894b53fe503456ee5189eded21c4952. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZFZ72436089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ddd0192a7e87b2a70aeffffd3405ccfa96ed24c23b042fc5271e6c6fe1f464. 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/USA2P2325685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd581eeff27c5a96888238dc039e6eff56cf4287c28aa201b41a9c94105bf667b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZHN52311721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4346ea1a2e4d38a319e26bed7a2c0b776a34fad7e1b30d21e11460f1f0450502. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZES72321626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1453a268c1be70de9d2c6ddeab98cfca0c881f7369d1af5276be0cb619c15b2. 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/QZES62342926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7511a8727eb321ff099ea05d4915aceafe3e8e7c2b27053766c8f1f19ede98a1. 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/QZDA82365239.