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 0x521ee6d15e21c857b01a61410a05b0de00e1f1f09220b6933253a5607d27f1b9. 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/d877c35a-4544-4c97-ac0e-2bd407175819.json and https://artists.proofprofile.net/proofs/artist/d877c35a-4544-4c97-ac0e-2bd407175819.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 0xf9219a57f8383e926e0127c127850c1d6c82a7feca874879b4748f4a45196218. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES81926825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591fc4a3121c00491c54c8a92bbd4e3a7178bf25573e4685d90afef65b037ccd. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZFYZ2249137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a4fdb68dd3bffb51f5e526f92d69eb3cfc67121481539659e0ce173ee261b6. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZK6J2254752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c63f4475fb2c3c0559354266ed50a27f7bd8fb38777a865c898c8ac2e6ce5eb. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWV2290623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c63f4475fb2c3c0559354266ed50a27f7bd8fb38777a865c898c8ac2e6ce5eb. 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/QZNWV2290623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e3ff8d5e7ee5b1d25bbf7d9fdbd88e3c417573eb643bde7d8f34b6b67afcd2. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZNWX2336211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8957ca2f876a28390f0f745365fa3f1263f9aea7e7b5afbecdb1da1b61d464ac. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZDA82425606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da668cc68ce98205e645790727ac5c3b44ff48203ae6d315b10d4ab22a790bf. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES62427679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa51f9d2dc7d134b0717c1a307f71e611095a97e0dff0cfa1f22b285ae67c0e2. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZFZ62487286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8cd500910fafd5f57f7174b11f621e5802b3cb2b108ddfcde07476b665f0af. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZNWR2409019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7317a99f8eb4c474c2bfae72c6fa28578019eb8e008b05b995f818931dad73. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZWFH2464319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a8d599a79cc7f0382fa8e375beca9304d93a46911adf4f0500a3113534a77e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFL2433051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c20d18b17963e8f4ac002142f662ff140ba556ad022bb05d9577afda5b23ec. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFU2432658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b4fd3d6090c16167022cab2709544e1be7dfca3a48def2497cddd5fac043e9. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTBC2484976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e3ff8d5e7ee5b1d25bbf7d9fdbd88e3c417573eb643bde7d8f34b6b67afcd2. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZNWX2336211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349a51270e98bb9e2f09671338e6ae133339fec789276358c606d61cb3fb41b4. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZMEN2432802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553e88da31c6ab5d84ae5aebf69f6193dacf864ab2a707ccdd78eb5ad1d917f0. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZWFF2470916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f4fa013b0f6e484bc8cb27ed7d5c69ba2b0a706f44a3760394904b4d2c262d. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZTAT2449311.