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 0x2d3ef0c6eb01cf38d516060df802286bcd538c014c01b22af6bf9d3372db9f65. 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/68e38d26-7317-45e3-a39a-b56a7f7a48cc.json and https://artists.proofprofile.net/proofs/artist/68e38d26-7317-45e3-a39a-b56a7f7a48cc.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 0xe7e7d898d183af9d279815cc226217c220f5056a91b5857d05260f1ef3d3a70e. 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/QZPEW2480207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7565b9ccf69be6bf2158fe2638f2718f1aaf6f2212e02799cef62549ea24ac7. 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/QZNWU2494159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed5857cebe072d9d9596c8708fa113dd78a4d8fb905114e3076708d394b21ff. 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/SE6HN2403762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9246a311ab7ea1fc80c905d79b230e4f943e3db344cb3228b65d0e9eaa1abd. 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/QZK6J2465486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c436ac990a01ac6308e0ecaa1699fe8e29fe0ed2456e1ccd2f8b4b66ebff12. 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/QZHN62473313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54664664ff583fe80517cb9ed7041e1b2c5bb22b94417489140256b13a673ac7. 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/QZWFR2362160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bfc3eec0dd02f2c913479a2fce4ac1e0f8784a3bfdd7cbc0bada8a9199852c. 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/QZTB82315694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231904ac049452471c1ad0004fa53a86d823887d9197a082570f62e5c6cec51c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTAX2361240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120ecea6c0054c553dea4fff48c68bdb8a40cd18be55865259862586ace2952d. 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/QZNWT2379311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7189dea300e80f517a33a7c9fca23cdb9fcec64a7e475e4a835f2ed60740d5a6. 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/QZK6L2357681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5460033f33a6843502f70678bf7701517917e203e3cba3c69bab9810f1920e. 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/QZK6N2329217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cb2d6a0fa0ceb262cf108d4f27bac24f524c2983c7990abe04f3a61d36e826. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZES72303757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f87fd195c4c9fdb7c0462355f71ca90d2e1a1a87b812322a65d4bbf90be830. 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/QZS642363007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6da59d42e659f3bd783af21ef5c86bb7de59434699d4fce980e0553a53b9181. 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/QM42K2261301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438168b2eb7768057c54d7ea43094b39129853740e7b6f3feeadd8db78d68636. 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/QZTAZ2278979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f99ccbf3b06a4cbe22821815279565672b498fbb5a0fc01716a9de61ff49bf7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTAS2236390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc83cff937ef77f03fd1fac9379172f496440d8fe639139699affd7b97042e9fd. 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/QZNWW2282959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574eeb7069956caf5afcd3dd4c8aec4d684bec3d643e219350f82a772be71c94. 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/QZMER2292142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45de84013e433777bc62d31f918f201a1ae7dd86379d5e1135bf7506cf53efb. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZMEP2219457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fa79b7414fa7d4600a117042e5846f6ed705d3464e3cdd36233839f293b926. 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/QZES52239467.