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 0xa863d4056d3014e4ea073d4f086c0f02cf67cc2d164a85b97b82cdfa324d49d9. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6883f219-f8f7-4749-ac7d-bbdffd48882a.json and https://artists.proofprofile.net/proofs/artist/6883f219-f8f7-4749-ac7d-bbdffd48882a.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 0x7ff2addd36ef7c62d4a267d1a77b62419f0770e6f1e1c1369af6495c90bdda18. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GB8KE2215740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3269e7d4f64fd5c0d581032e68f099e7fcc9ab797f0487305b6f2ed79d1200a8. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZNWR2436659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273299d09286879d368b3f580ed6d6d0428836a953d930393a7c0d42471af55c. 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/QZHNA2459062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26751feee5d696450c183f9eb199b2bff797de49ea642b9a1f502ad5b7379328. 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/QZDA52425815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07afa126b25b9dcc09315a38d1de9f3c595c3d8cb2def59d3a88f0811fe8073. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZTBB2309630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c62f1a6a0ebebba9ad08077d63db130f8c989874a4a8d48042c601e2bf1d4b. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QZPLS2390119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed0a375554014b5f9ed4382df91535f82dac0b151032a203beed7adf095feb6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZPLS2390120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42341c9086e48eeb26bc34386e5b684e41dbdc5f7490d4087392d4b9c14cfba. 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/QZPLS2390123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa784db919253ccd9880f19cc70ea8ad35a98f0c7a7c60dee2a77014385d0a9f3. 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/QZHNC2332465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1183c53301b2865988e04cdcfea808d4db7428d2da84be8dbc30c43d33f30f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZHNC2312391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae64e30c820dd7c4542e913d2eed30ad4ba8873cfdbce362862f68d23883c3f4. 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/QZFZ32342252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d7fd297b65f417e1e7e089e79092296896f552398bdf3b644b2300b79d38de. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/UKXN22217163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725940a73256e0fca5d7c6342837b0631d03f441d4bc8fc4b441eb08b072f256. 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/UKXN22217162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4689df8c2869ff8883aca33bb6708089e1a019f0deb435a51e1b3d54f71e3243. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/UKXN22217164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba21294af31d2659428cda87a1f70518a6b03d0315572af014eeea54df4e7b4. 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/UKXN22217165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dc5d2cd8aaf9c9d0a3f20fad390ff39b335dd2bc7b7ccf4ad1a017cbc4e169. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTH92109996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c00c7b1ff0964d47bcb43a68dd791e91339d2c23e8111a0f0c68f40a9de083. 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/QZJRB2146716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70c2c9c4e6d3c8051ad5843e8d5faa2665c25b5dd0a99e07d13ba64b9112a1b. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZF8N2145970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d14607b31d907f7a17808dc3b6a9a9b157c55ec603cd242d90508dfd7ca6169. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHPJ2082226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a23fc40c5c26af13d98cad85b136c5b57c07efcb0998be202cce2a7c458cf91. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GB8KE1857538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a1c848d1fdd2ef39ee77255af9c8f7b49b682466e8433697b8e880e7d1068d. 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/GBWUL1800886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8faadbf9957bf5ffd70ad37551c5e080f50432b9d919d47ff68a705c2496a63e. 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/QZRP52502160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3276ffd8bee255ea302446389aefbcf65e43ac91aad2e45fba48f4b6b6907729. 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/QZTB92481408.