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 0xcceb076b226ad9cc9847ba2e04b624258dc0408c21aa9dea23075d85175c973a. 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/6ff89585-5a92-4913-9cd1-76a1266dd0a3.json and https://artists.proofprofile.net/proofs/artist/6ff89585-5a92-4913-9cd1-76a1266dd0a3.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 0xbed884d12130e35b1bd9e1750a6f3587cddfb63be9de5a7977fac9964ab163c0. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/RSA3U2400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91662ff0afabbaadcc22b8f905a5896e166ffbf90d24e764500ba7f52a78122. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/RSA3U2400162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59013f750a0cc925387ff9524e47806723be72751800d1ca93598f228d317c47. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:47:21Z), 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/RSA221991591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cdf82c7c0a7a70f3ad03d3ac915f09a27c623a35e90570617b6e61d160f469. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSA221991592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1628c83daaf23fb4e311ce86693c94821c3178a0eb1856e395cbfeb1bb51081f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/RSA221991593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b63c3fcdf6fee0b7175240892e1d244936edf44bd21779f77a4208bc548d753. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/RSA221991594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82413e428754564d2530791c2283f3858973479ce7e6b62fe878ce098541e46. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/RSA221991596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e396ac563242a3858ab66f07f0c168080f4d7805829f1e2d71adc1b5cae550. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSA221991597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcd6d772524a7deb3341658d1a569f751fe05527f7c42caec1c8e7bd91ea1d4. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/RSA221991598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574cb767615a4d997483d55b01afe9ecaa7a2acc5dac6b6d0d8a61d631f8150f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/RSA221991599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586834aae5588700394e9fd7f51614ed760d0f93a4f60964d9037b432b87bd2c. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:10:44Z), 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/RSA221991600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd844e66bff1b58a488e19793094e400af0b5eb81c2bf9eb1c638ddcf9c5f679f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSA221991602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7830ea38f0d19d35f3953df6fb924ea36ce95436c7aca0dd398bc986bb3839. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:14:34Z), 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/RSA221991603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e89cf2ee550866180d9b7ffc4d8dfa16a945fe35b208167af4d17fb87483c5. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/RSA221991604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016c85c193e82c066d1319faa1fad9707bd789b12955cf170bedf01421f170f6. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/RSA221701189.