Yurtseven Kardeşler (literally "the Yurtseven Siblings" in Turkish), or YK for short, was a band working in Germany where they used to reside. Between 1985 and 1987, they released two amateur albums a
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 0x3ea2f305b2fdafbf6799de7e3f86c3d07712cfba32bc6a32fbf45700d2e11441. 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/591786f0-be31-40e2-9abe-c324002ecec9.json and https://artists.proofprofile.net/proofs/artist/591786f0-be31-40e2-9abe-c324002ecec9.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 0x2e83b1c47a439a35b4cf1c9b39e1cbb5a23507e0d84b95339039467ad92998be. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TR0631200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071d62d3056bdcbbfc1c460b26a8d4df2f5d908f712395f677de1df4c4151df7. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TR0631200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7346a0ad78a65ee9f0e025ff0e23ffb80477469bccb6bffbcd563672af41168. 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/TR0410801764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e1c94ebe70d275d0bd9c356017de3255a2ae3ce219e368817ddf770236cd05. 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/TR0410801765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a2eaa52a29d10f9c3d648861e43611d49ab65da41f3401dc778ccbd0787bd9. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T21:31:13Z), 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/TR0410801769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dc1dbd1cf53b04eba48bd443e3d5bb8095f6966509323211cd07ad4a1e9e58. 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/TR3910640022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d38110cfbf782979563a84f300bb7a3a525e60cc56bf833c7f93091c70d259. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TR3910640025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4975b67a4d61ba9e470704473baf51eab51711bcfbdf1d76ddfbba8250070be2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TR3910640028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f0c4c852a458ec1a91050684581c3a539ba8c2131be3502310e495fefd1707. 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/TR3910640030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea5faeedf90f7db3784ed1937db2ae6dfb25fcbc5b05597a34d7080f142efb9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TR3910640031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175c62df72b634103f537a9a9ffd3323b813c2e976a5de794fc55cda55bd9b03. 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/TR3910640032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d01607f0f1179c91e19daa7701ff3716944d50232d41978bc4fc0fdb2565da. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TR0410801789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d4f2bd97ea1f933c9096ef03a0064585c03a791ba8ea4c9444a4d3d958ec2f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TR0410801790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c9e3dbfd0c216836015820c6027b27e1ba8157ef71be0f61a2227a17a8a387. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TR0410801792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e43c97743148ba100628d616f1557a046c04b83dab520b19628f7ee93cecca. 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/TR0410801793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c4b9c7a161abf42392fecb4624f081cdd68642c60e7b56d021dd3841346109. 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/TR0410801799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8c59d44eef490d0ad49d8720f7dbe9facf2a6211ece222e68ba4c110ed7f7c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TR0530601762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1637af3e952336c2c2b6dc2c3834de55a034297045371cf462dc9708e3f192f. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/TR0530601765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb47a6ed580d6d193d9f9bf4a8db3eedcaedcedfee046f7b6bdadc10d9a2558. 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/TR0530601766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268102af1c56d5222b34a278ba3fdd6cda79d4726531a252ead7f08dc8909897. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/TR0530601768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d98f1f530ad9f610e496157164a040408f3978fe7c974ebc88c8e014cf9de0c. 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/TR0530601769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8703e243a3afc4c42ce26480cc5beb7db4d6e4eed25c97da6baa1e31ec5ce0eb. 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/TR0530701914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc47bea86951d389574fd6f7a5671eda9b16b581da227c26faa0e944fa9695d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TR0530701916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f16b132bad267a844b29b39b3117229f3909bd0d96b0966abbf10c3e628bca. 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/TR0530701917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7187bef3d301efb4a9f54ba9b32f33da9f261c259c80cfb14404de8caa751d5d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TR0530701918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29d44262dad6d2eeec16199512fa4faf41ab6ee41535426fe77a47a9b4198c. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/TR0531605641.