The Marcal is a right tributary of the Rába which rises near Sümeg in the Bakony region of western Hungary. The river flows north and reaches Ukk on the Little Hungarian Plain. The Marcal follows 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b69fdbe2a84bc79977bed3dbe267475c5d23fb520b1c318eb645d75bef327ab. 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/a0b11a90-a60c-47ed-8f87-85d3a779f3e6.json and https://artists.proofprofile.net/proofs/artist/a0b11a90-a60c-47ed-8f87-85d3a779f3e6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0721ce48abb8a4319788f07a1e54457b93f0cfd231006213444f1f0da59ef0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITN3C1900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346f4c992ab04467d6ace8e272ce543a1d18388d7a42383997da4f09e11608dd. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/GBLTF2000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094a19649ebb7014bf1ae6ce5eabb03a0291779f31c0d477f687a9e0edb30fe5. 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/GBLTF2100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73dd09f7259a9f7f192cb177e6d213997cd873a5875787cc72883e0c88f7b74. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBLTF2100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58aba0a099d7c8c558c8ab4a212cf44248389eb06cdc9e36ef0c406d3186278. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:55:03Z), 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/BEN582100999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e3b71cff08853e9d1fee19766d4fedbbd750a76ff7fb78eff2b03a7fe82462. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMDA62187015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3810aa44a98ac3b259e5c84ab5a32de2cb5bff54bd72099fbad8c275c263e13. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QMDA62187016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12185d8e951a049c7faeffe8676017a536c1db6a446b52f9f21655900c8b1d0. 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/GBJX32110027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca54a29b04201ff1dc604fa0a9c26329af32860790d2947a02785a2fec3f682. 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/BEN582200834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc82bdfa9757cd4ec36cefcf9f06dd13b10b4b644b74341f200db86d355b3e22. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/GBEXH2401966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13deefdbcacd4d19f37bdbaaf48b7af0bf7ddc3d1dacb1792f9e06c2c4a233d7. 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/NLC8K1400392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3cb6327f26d83808af889cb2ad44c4e70c83865776d62b85e15e2f06d94bed. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US83Z2223552.
REBUILD - Earthquake Fundraiser Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba570b61699bd5059a973785f21813eaa861628a6be921b186de27e6b8ad234. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKQU2334830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c0ffa37f95e7b724bd5b6d4055a75669702b1037118267ea707812d2eb8cfc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBEXH2401935.
Uncage Mission 03 (Curated by Hertz Collision)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7c6404eb8dead8511d40337d797e6a69bc810b61e4a94734e9523bf2939847. 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/GBJX32198045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f877a02535e6136d1d6454de4b40e6304c1dd299b3e1f3340140e97766a072a. 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/DEPI82310584.
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 0x9e6504cfe15c2ed6141200403e0714740f5a89dba95471e1585ef4b7b9b42f4f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLCK42210511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda8e533b88b97945b85fe655f5b3a1c246a4ec4ba245277916889c6ee75629a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLCK41081813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632bb684c837dfad96eb3e6c65eb1a7b5d369b873d5c84dfa5c59d945794915c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BEN582100861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34d8b58e286942d371d33341180220b44bff0215a5d7154857dc194e609c2b1. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK42224569.