Perko is a surname. Notable people with the surname include: Aapo Perko (1924–2021), Finnish shot putter Franc Perko (1929—2008), theologian, archbishop and metropolitan of Belgrade John Perko (Ameri
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 0x664439c5575e27c2d30d04c2383000931dbe063576cf22e1de975fc93273a286. 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/d0ec0ab5-9bea-4af4-b707-8caacbf249ec.json and https://artists.proofprofile.net/proofs/artist/d0ec0ab5-9bea-4af4-b707-8caacbf249ec.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 0x3d03d3147113c3f4f0411e57a2733586881bf3a67351bd96c058b6e1b353d60f. 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/GB7CH1800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0668c89eb033ab0fe88b884884571a85fb43fa598edfe30764ba85a835795d2d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GB7CH1800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd94ca7db3cc39de4f6b6dfb57bf0f95065bcc215d313c5901c551ab8e9a613e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GBHLW2004207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31fca5239d1b94d9e66a06bcf8757536bd87b550c1c04c6b44493d06f91f66d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GB7CH2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cb03534fb2909d02d35637cea5074a30feca1dd73e846a0494355f036c8b86. 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/GB7CH2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c18a10c9b5a7952427707e74e6ec63798ad6278e8b80b5f9ff4aad3c5148b5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GB7CH2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e47a530b57afb8224cc28c997b5db66419c3d7be0a980e8ea30fd11fe36410. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GB7CH2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54644b2a8e301ca9879b8749d0972fa72a79ceff5d9e6a7d93d54f9a1e650d8e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GB7CH2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7f5d366f326775a2a4a8cb0c33bc181c09d0c4d742f9a2187b55789bb1faca. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GB7CH2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fbc80a91d3feead668fdc36961f7930e1c4458ed50b034eb72ef608472a634. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB7CH2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef00b21886e55f064639d6495308fed81ab516ebc9358a44de5d4bf19297dfa. 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/GB7CH2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7e9130bb07444ad8079f9988a0ab256cff8680e9014e11dbeacd83a168a9dc. 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/GB7CH2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b475a5e5c25b11435bc992b45bdd0f39f297dcb20ecd95f8b91753d290e2b54. 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/GB7CH2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c18a10c9b5a7952427707e74e6ec63798ad6278e8b80b5f9ff4aad3c5148b5. 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/GB7CH2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e47a530b57afb8224cc28c997b5db66419c3d7be0a980e8ea30fd11fe36410. 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/GB7CH2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c18a10c9b5a7952427707e74e6ec63798ad6278e8b80b5f9ff4aad3c5148b5. 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/GB7CH2400022.