Ocin is a village in the administrative district of Gmina Wróblew, within Sieradz County, Łódź Voivodeship, in central Poland. It lies approximately north-east of Wróblew, west of Sieradz, and wes
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 0xfab3567859ecf6917b7752d92928dc339a4410bdb54c3747fd27686430d27123. 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/af694760-cc89-4fbc-985c-108bc66c255b.json and https://artists.proofprofile.net/proofs/artist/af694760-cc89-4fbc-985c-108bc66c255b.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 0x86ea1044d464f62a500d20a20080f4b856ec9dbdf9074a7a7cd1423e45eaae07. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZMEN2155583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636aff2c6abfb47324c70a77a19319c3e151c125d43cd80d64c07683a95fd8f1. 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/QZDA72218315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50536d3617097c9f8eac8f9c9ba26d423328b0b521b238687e51b79335ec4539. 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/QZMEM2206067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe843c829c236c3be4f261f4f0f0b9d8facb7c788d7c8011d1eefdb0444a7c9ce. 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/QZK6M2232051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bbcecee62892ca83ab7b590dc93b3157a7c32a80ddeee7634124af6b1b9361. 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/QZRP42238614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84737289a865281416e3f0b42ba1fa293848bfe574cfd7d151d2c7b7923f637. 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/QZTBB2253863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c60fe5e7e958d818914c01d441be4c1a5d15f4f39c67aba479f3d86aa5b8d1e. 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/QZHN82323343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b183e794573481e5699a4e43177597e9a1baf0c4b722c39ca3a409a8f4a797. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN82323345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd908ca74a09a03ac907a77f18ff1c99e14fd0231e69cab1d3a7789b5d8cc3264. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWZ2394282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe483afb972eb71b018261c697bd2cad387a3bd34e5b45426a8d2e1e3ff9d9ed8. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWQ2363169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7026e39e634ec54b824db6ae21074807d93790fb038d0a22669cf40fbe15637c. 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/QZFZ72466136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a42f6e82fc847e872bc5bd0cbea138732c696c8b9dd9f584e0347f276ce4ac8. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZFZ22468739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001ac49369986c2c58aa6fb52f6b6e0df4aa999e84175f974a113a248da69de1. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZNWV2465158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b4367b2bc945ccfe558d1e2ea3859b22cf5a024dfb5254f0c9ab07d2e72847. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZHNC2428044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e4bd71d7cc6e9a6a9e962eca3512cc811ff6705715ecac514bdce28ed19adf. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZMEP2451042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768d287bbfebab33f34538b706c13b858562fb0ed761af42bf13208fdf9ebd3e. 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/QZHN42417174.