thumb|300px|Dakh Daughters at Rudolstadt-Festival 2016. Dakh Daughters is a Ukrainian music and theatre project started in 2012 in Kyiv. The band consists of seven women, who play on various instrumen
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 0xb5d844016956838411769014d1f53bc4a35e5be49badce3e8b2d8bdbcee2bacd. 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/b7781f7a-fc45-4215-82ef-3f2b0c6d4a24.json and https://artists.proofprofile.net/proofs/artist/b7781f7a-fc45-4215-82ef-3f2b0c6d4a24.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 0x7e66601ad0925fb6864f6bc1cd1419e53f8e86de638eadd81e91511e596b7926. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACU1607569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4db34b5d89adf337bb7b653acd1c48e195b2947768c3cba243e9448dc6edef. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCACU1607581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2b77865fe15ee1133581c669150048997e8b4c47e0649985657af493881206. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCACU1607584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45b83479d1468b76ccda18cf0998b8591c25ed22d553868cebb42c512987c88. 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/TCACU1607585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e23d988accb649c4a69b7d68f94d022294232d2752bffe8de13e5aac387e56. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/TCACU1607587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c0ad1c4aedf45dd3f4f1ed504b9112e2caeafe15869f5aad6e8fd595e1871d. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/TCACU1607589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473ec27ec2548fff37b7220700c7195a8abe77a6b1113ecd96332a4f9aa75047. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAEE1910303.
Pisnia Pro Te, Yak Vona Vykhodyt Na Krutuiu Horu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fb4db97c304b9df37ed395a1190f492110d1fc98647cc297e2e377337b95e0. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:25:27Z), 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/TCAEE1910317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c02a1e202a584a83ccf70a678e749ddb98e4ef20e9d6df96b59a12b686a33e5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAEE1910374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a79f3021ab1bc0479e1a738dfb4fca1e4d9681ef0d57e03cdd6df2e73e0378d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAEE1910403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3cc0758f2cebaee134e9d38a883d6fbb75e15762205dfa60687715b5f6ec87. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAFJ2172914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35815de5767e7c8fb1526d8c82c3ecff63785430e52cce0cfbf7703221d6d977. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:09:19Z), 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/TCAFJ2172932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26717c05466d90dfd453f45bb8010221d298efb2252acf353b58f51328a58a5. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAFJ2172966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee92bd7deaff3fa1c36a6e738ff1e8a346c1d15f1e81661d2d6369e48eedd8a. 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/TCAFJ2172986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0c7557a415d7fb7c2e60ae12681530e7160e4944cd58796559af3f2ca0cb52. 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/TCAFJ2174225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bcdea61e2f2908101455a704220b13556b5152d7ac4e02931606ef9281de2b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAFJ2174249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d62d06d8758588110830eea7cce9a8c7c5cead3f37626ad313996ffa0b4248. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAFJ2174259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbacfce31a2bb48334bd2f6cc7636a4a97669c50fb566506f456883a36911010. 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/PL44J2516149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca9249f1425cef36eb9bb2bd4f59284838bc7a38fc238667aa4ab894c3b75ee. 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/PL44J2516407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1eb09b53edc93187d82bfb5681f82a4885a8bbf1c562469564484fdb0c140a9. 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/PL44J2516408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cef497d5a6d2ffccdd3bed4032eae76a6d34071c4b99c64929cb1184f609cc6. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:39:44Z), 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/PL44J2516409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2555fe006dd1aab542a683d760f096e2d10cc4e11aed3039036435cc6fc0eb2b. 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/PL44J2516410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516f7fdfc0887ba5161fa005276efb0201c693850cb84d9bea63740f2c5b878c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PL44J2516148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff578087f27be167499b0841fe7c70d15804c7435dd511242bec106e065089c0. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/PL44J2516411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a085b1d092194c753dcd340eade5bd136e25cb48b30ebf0f52fea03118b3a2. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/PL44J2516412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb870e32d1d5cbfca773f33e61d2a1d154a694011b29bb31ea5c72739e74e1685. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/PL44J2516413.