Sancak may refer to: Sanjak, an administrative unit of the Ottoman Empire Sandžak, a historical region in Serbia and Montenegro People Nurşah Sancak (born 1997), Turkish female handball player S
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 0xa067d94820691557a5f65d3ae5467e66793c4a08ed21582e6b396ef2bd3e132e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37f244dc-ab83-4dcb-99a1-000d13c4d7f4.json and https://artists.proofprofile.net/proofs/artist/37f244dc-ab83-4dcb-99a1-000d13c4d7f4.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 0x287252ea79bd31292779786b37bd5874bb54cbe7cd2a4f485380d5b787854356. 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/UST8K1682014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc3192796f06e6ecd2009abff8ef5c2a5c937f85a1854504e3e43d889c13d2b. 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/UST8K1682015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea01ca0f76ab4c7ffa71bd5502203fdaa17245a5de45500c4cb1101b1fcebb8e. 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/UST8K1682016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a3e5c43e9bfdb6d4710f892b1f59e09fa7b97e3c991bb2e5f1099b9412e221. 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/UST8K1682017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa662dca9c060da0f30c7d7a20aee85d598a59c2fd21ddcf69431948f8d491302. 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/UST8K1682018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8b4b1b6ce07c2ee07578b54504e4e2107e8c7cb2f6c44342a6dd6b56998efe. 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/UST8K1682020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0d9e2dee2262553e60b97dbebc008691edaf7d333b8e7faadb5b8c87c6db27. 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/UST8K1682021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8de268e3689568479674455847cbab4a12a976d7557a8e7c9b07f85939f23c. 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/UST8K1682022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd581702ce2cfa72acc26477ed60cdb647dbde066b2a5694d9f4a585699151c41. 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/UST8K1682023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a33f27d0c2835f09c3f06ac2b650c95f1115487223d883f5401cd6c47f7aec. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/UST8K1682024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee08ea2da94bd0b9b8adec5eafe748f333dae1ec2247775b71bda09081699597. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/UST8K1682025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da9f82d35da7117483718afa8e50429b8434717ad302bf9b2f4b5f37fbbe25d. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/UST8K1682026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bffe562130d94e6b861ffef509150eed34e6990a714c06e244eabf24429a2a9. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/UST8K1682027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe895c3e91786c8921c5f710c33cb15c250a3a2fbeaa3d3151481658092cc9be9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:19:34Z), 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/UST8K1682019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263183c8c68d770013fb2ce4fb11d86a068b777c824b6447728ca15862d1a6ed. 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/QM2PV1633202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818d4b161daf291b63f1bec8f2ea1cf1ece460cc80c7aa5e8b827f7c3ae1b119. 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/TR0441210204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cb1b5bc1349572238802e268dbcd563d96d64bc4541a61b96b054326e3d2e5. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:29:23Z), 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/TR0061300537.