Djerv or Đerv (, ; Majuscule: Ꙉ, Minuscule: ꙉ) is one of the Cyrillic alphabet letters that was used in Old Cyrillic. It was used in many early Serbian monuments to represent the sounds and (modern
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 0x9a9d0def220d05e216e37bffbc34054d7e9ecd816c358a423e1e69ac63d45c93. 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/af753bd8-371a-4c7e-a0cc-647a7863e962.json and https://artists.proofprofile.net/proofs/artist/af753bd8-371a-4c7e-a0cc-647a7863e962.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 0x074f4f1c719d836ba81a8bb3429c5702f8eea5d9fa516eda26c5900d247c7cfc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NOCVC2262010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d44ea7b84bb6d93d3a8998d7e922ee5471a8d977f6b4446e15111aa15af46ba. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-21T20:26:25Z), 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/NOCVC2262013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180588be73f01cf46b76d06a799189dd0f52683a97ad5e0c9b3ed63a7755b927. 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/NO2TJ1101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf020a0276fbc37af699a81a4b358be49025ec739ebf568c3da3de6ffcc994476. 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/NO2TJ1101020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a045bbe2fea699faec019dc0c42aa1fd9d8f7bff58da3948062cd826174bca. 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/NO2TJ1101030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15095641491720339dc0ce44e54e9e0a9cba372d29fe930867a824696a39435c. 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/NO2TJ1101040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8de035586e62fef333598261c9befafec37d0ae91437cdea0d0d4e7ab9eae4. 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/NO2TJ1101050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711fc7825caac8fcdb3bdbf7a378c7f47d09f4064f1e151860dbb81f1719af47. 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/NO2TJ1101060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3ce4cf8f3fe70ba81a665b5705f8d2903d8750b9152975f5933b98b736e1db. 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/NO2TJ1101070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234f6f35ff1aa80b4aab261fb02a25e854a0f597eebd9ff62024685696b533bd. 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/NO2TJ1101080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3ed6f43e34a228975965db630306d990c27f62123cf589a6d3364bc9af20c8. 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/NO2TJ1101090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86307f06154f62769f2e4f0679df1df243187e1c07702453c02d530a3ef1cd01. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NOCVC2357010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab56f34e5002ec79d6195d0b07520a36c308febf1d2bc825fe7c4e454855664d. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NOCVC2357020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c2669e3f84e4de8216f5c4011cde9e7ac16862d0021058f0a5ebc5c9c20fe3. 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/NOCVC2050020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c9d773cc28a3ed0279a23d32cc01167fbebfd98bd47df24cdc56514fe0201d. 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/NOCVC2050010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c9d773cc28a3ed0279a23d32cc01167fbebfd98bd47df24cdc56514fe0201d. 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/NOCVC2050010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a045bbe2fea699faec019dc0c42aa1fd9d8f7bff58da3948062cd826174bca. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/NO2TJ1101030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c13c4756ab759bccda9ab11ddc16632dd0af7e084b1733893991267f15e077. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NO2TJ1101014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86307f06154f62769f2e4f0679df1df243187e1c07702453c02d530a3ef1cd01. 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/NOCVC2357010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7f58d08935f064d57c2a222df21232c2a366de151e7f9a3045ca3b133bd572. 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/QMAF31400023.