Erk or ERK may refer to: Politics Estonian Nationalists and Conservatives, political party in Estonia Erk (historic party), a socialist party in Bashkiria, Bukhara and Turkestan from 1919 to 1921
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 0xffd87e4bc7dbe4f55897d8b4c40a74bd9c745cb7afdd005eed1831fd5b06a7b8. 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/492a1b42-72b4-4be4-affb-4b782c635cd2.json and https://artists.proofprofile.net/proofs/artist/492a1b42-72b4-4be4-affb-4b782c635cd2.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 0x4aac663ec3dcf8cb6600905e789f9f519157ed0cb327392f449c1e2a46fd89ce. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/SEYOK1428124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9110185a052ef94f2b62e05544b0b5457f8d3f3aa0788873d44a0c182fdbd04. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/SEYOK1533531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b123dba549daf2021e12913b21ef3440db092f15d2729a6ac54bf7335524d5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/SEYOK1533534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8557d5e03168c80cd0754fee635d7176eec8f57cae5c7288396d6a77a3ce9b3e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEYOK1533535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2818f93f4111883842e3c526b4dc98f4553d01df1ca52228b875422fc096f4. 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/SEYOK1723039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5476fb58ef8e7d11a72e7548be7201161ce451c62f26903d4a0f8a469ef5e3. 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/SEYOK1723040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20ab6090959ffd748cee135b698f582c14bde45e26585d582a77320134a0f83. 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/SEYOK1723041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73021417d8f433951861ae5a3f750eb69a47d32750467d99b9eb06c4661d5ebb. 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/SEYOK1723042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7cd87519eb023f794f8ef47dfab2e42715721c0fe11746edc4673668a429b3. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/SEYOK1723043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2564b3c6700afd52d99aa3f4ba06dd3b7d6d469fd265cb775c111c2310a86e9. 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/SEYOK1723044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefae51e2d3e492d045a135b9909ad60bdb735d1632969c18bfe41b6b91f6bfb. 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/SEYOK1723047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ae9f5b6fe6ad332eccb90d87bc25e0267aa4f851e2038740b782e2f023bbbd. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/SEYOK1741878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ae9f5b6fe6ad332eccb90d87bc25e0267aa4f851e2038740b782e2f023bbbd. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/SEYOK1741878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc06277ec77de6c4d1b3c0546cb5b7fd0d162bc8cd4083c706c287b321d9c96. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SEYOK1741881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb820aede8d12abb8d15ddf3217ec7b2c296536f122c5ed7f78c0d4a8fa29dfb4. 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/SEYOK1849620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc778e0ed10bd27aa679f3962201d91a4a088eb69bba4cc405e46c2f9ce7facaf. 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/SEYOK1923146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a824e5c8b59a70a70536a37d46d95670af7b9763ca6a7fe2868f21ba39422b3. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/SEYOK1930919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e1aebeff2b64643ed1b839ab29c3cbdeff25a7bea70b78855f15689e8a3d69. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SEYOK2035306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210d8282f7c15d532f98042cc72c532948b7c12c498143dd475061e77df63075. 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/SEYOK2122001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4504533d8683b16e451a46ecfc203e3e90a059089af2a9724b91222bd8d68b5. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/SEYOK2158278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebc76e5da40248e72f804b253cf0d27f63a9bec0c8c09f01390cc73ccef3244. 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/SEYOK2223522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe317f1669ae4b70eb84aeae6c0e9283fecfdabbd14930d2ab82ee36e972beeb2. 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/SEYOK2316824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6046392d957fcb751de767597b67592ab305b2a86812f123a5aa4c035c55d4. 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/SE5BU2493303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8ba3d011cd7749e535b321f054f62a7fbb5ed17d1a65ebeec750e1c5ba0a77. 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/SE5752445946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71135e16d7de725da236f1949dec147ab35e1810d0afbe94e0e56f6cf326551e. 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/SE6HN2409311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bee348a169a2e5bf628a038b48c5b670d2e6ed90cdcf8abaf314330019c99ce. 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/SE6I32452447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc7401e781d700cc0dbd07a65596d9c976c389ccf180cb1905cc52e49fe0673. 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/SEYOK2024860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd218838d02e127c00eebc9a6061d999656ca4d1eb3a356bfb1f5a8cc09845. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SEYOK2024861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1f4e801eb42af831cc147026ec793406d42694c03be1c7434bdcae8440a6ca. 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/SEYOK2220983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97539c2a7cfb8b99aa046d783e9d8b0db792c5a0f7a854a619614ea07820d5e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNWR2201814.