thumb|upright=1.35|Grand opening of the first Dada exhibition: International Dada Fair, Berlin, 5 June 1920. The central figure hanging from the ceiling is an effigy of a German officer with a pig's h
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 0x2117ba5fa9847d548d6b38251a9daf3745bf9a0d820855857925f77c4c05f1d4. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/272e9240-9638-46e0-afdf-e6f0adeed7b3.json and https://artists.proofprofile.net/proofs/artist/272e9240-9638-46e0-afdf-e6f0adeed7b3.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 0x00b4f228715978f2b2de8e86918c11296bec7b001ebddc0f51db578a45a8c88d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFN2455343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa88a386b33f415672635acd74ce2c315014720c7a2306b79a67158280b9ce7. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ772422723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ceacf19ea63dcecc4a42d5af3a12ace7ce06bf6a967887a9fea8c54e5ce34c5. 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/QZZ772422724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cca07da666b6dc98eeca7d69a23dc5db818ac2d3fe5dc6442e18e11ce01c2e4. 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/QZZ772422725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669e0392732d0179e402ea64cfb0cc6c97319b6d7e7e25aa6044b7ff24716bd7. 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/QZZ772422726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88135cfab73a9dc9052f71d46d2142bb023ab9c44c2b255e08ec3570d9681ff1. 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/QZZ772422727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bc63acf237680ce08f8047a634f40bdfb71a1ed049591548e037fd52e1ee9a. 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/QZZ772422728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9284935419f32b63211c2ed3b04ebd7b0da4f1c8f04f5dc2f3863f884ddd324f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZWFW2431548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943fd4ea6b875b78cd5e4c6fe4d334148bc0fc7e792283bd6500f1dfdb982b90. 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/QZWFW2429401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90512e5eb2ce9aa5b89b87b7d8555ba74294dcd401e1f4e7dd404dd0a21b8366. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QZZ772422729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47faddde84c95a7a8ff4cd5ba4d646d2c962bd11623203c9fa8f9ccbca8c9c9c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN92528143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9804671846b2176cb2d324f3cfaf4dc6106227ba5d23fab334ea2e4fdb6232e4. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZHN92528144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06c0055961dbd10b08d1d9f4f18caf8a48c0cc74b4b82283c96987bc34bc9fa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN92528145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24703b747b9a7453ea4fdba2028754ecb3c97315d9f487cac7347ad7f681d55e. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZHN92528146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656ecc1b01f9fc072816481c8d037cfc0fca5ce5a1948a1b1918f6b2951d8d50. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZHN92528148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b4f228715978f2b2de8e86918c11296bec7b001ebddc0f51db578a45a8c88d. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZWFN2455343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c573c06de684c22ffdab3f1e861c4c471e9cb6f0a053aa584bc6b90f22d817. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EX2538311.