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 0xf643ea3601a8058079111fb771418917e9d13944e42e385260bd08cc1c20a8ed. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12082713-8aa0-430f-a3bf-a173963cc676.json and https://artists.proofprofile.net/proofs/artist/12082713-8aa0-430f-a3bf-a173963cc676.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 0xd405d38f4071abb77879b5d462532ae86cdbdc52530be8eae1febf4eb9045071. 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/QZF8N1998701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7f867987c0caae28ef81e112626a21dc75866dd9c42f2416dfed3c24ffd06b. 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/QZF8N1998702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596ddd184bf514e36bbfd765a2e447a60004f37d20e337f01845e7c420e47467. 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/QZF8N1998706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a040417f49396ce9a641f909d550cdfc58330ea4c2be0e99f9232942886b2da. 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/QZF8N1998715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8011ab24e79e3e4dedd47619ed2a5c44945aec94ba81f9f0a7bfdd9e62b755f4. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZF8N1998709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0350dbe82da35f42390dc9da543fa36056d6f142327c64943570d99adc2fa7be. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZF8N1998708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3d5188bdb1500b4acfd84892f728badd78cbfaa93011e18a3394056f9d307c. 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/QZF8N1998710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9daab39cbf544c9da4d267a0093f94703b6c02f27c8be7ba2cd737943c7639. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZF8N1998711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82788c5b53bcf04f9314364343ea2f741992189a8156ed52ddfca36efff8787. 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/QZF8N1998712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2262dfad68bdc266acac35225ddc01eae85eed21d9dad3cff545f2a8d21f2d6d. 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/QZF8N1998714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464f6261d9624840b715e3232ecdc392a90e4b0d6871226c78a662c518283236. 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/QZF8N1998717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f4733e8d695fcdadbe75975cedb487725e923d38fe459bcfa15acf7d234b88. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZF8N1998758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdd4527d4605a1ea982fb609f662ad11c799a9e12432980a95952173dcbf210. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZF8N1998762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6c110b2e60ff4b43780bdf864ed48bb345fb0b04f525ef62ffe9966835a493. 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/QZF8N1998764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d3884d1adfeb4602c5ef1b662a26708b264fe99d4d76236611c68f2125b799. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GX3HH2182273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb0a67407cfd34ecc5972da9dfea1f194cd360801b409a060c46f77482227cb. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZDA52037442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1447d5669deb05bfd0b7c9a13edf7bfe76084d5772d3fba817cbdc5bc9b715c8. 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/QZFZ31983726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b97bdcb2b7a389342b52569df24f2af032eda5c415c48afb689120710f96f21. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZDA51957179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bc743ec36b013bc411049cba1ff351fa87139fb94a9a7425d10f4b79611e15. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZFZ31983727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f370995c2f024437476f822a1801cb8e02c6f607cfd88f661f8db7d4babb116. 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/QZFZ31983728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d09416c99961101d4e53eb9707ff1df8fd419fde8ff5cff0179383c6fbff0e. 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/QZFZ31983729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b593d20a889e21f3644523a4dbe4eb87c2ae3a53875b0faa52981b6893ee64. 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/QZK6G2062634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62418370cf9e3c33b011e33e61e6cdeea04520e99cfe8c048e00c154ec0a6506. 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/QZNWQ2045310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5624ded1a9b529f0d0fd444b357eb540be244b4ccd345080cfde59fcbcbb04f7. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZNWV2032566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf808686e97757c2bcf8a7c56acc675bef567726a4938354a8c8168b498b0b35a. 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/QZMEN2068640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b5d2727868c3fb59df5169af521bdff0a08ef313dd7e4a04c40c805cf100f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM2PV1841839.