The Monk by the Sea () is an oil painting by the German Romantic artist Caspar David Friedrich. It was painted between 1808 and 1810 in Dresden and was first shown together with the painting The Abbey
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 0x7caa505cf06362c15fed2c0588c08218aad5b831e5786e0217ce5a31eca14e7a. 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/16d28927-0089-4dd6-8c70-b0cbc0b0b1cf.json and https://artists.proofprofile.net/proofs/artist/16d28927-0089-4dd6-8c70-b0cbc0b0b1cf.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 0xb7299a0020889a14b328ae2d821b3710f6f33ad817f878c4f2d29a39692e2b35. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZKDK2013416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2859c53d160dd5ef9bad3de7a60210b0c7159fb7ad1586cc98d462e19df55ff. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QM8DG1835414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ccea8d1eff6de6fcf8f828c2df7f6f1b2937977a17ae1dfcd5774f00b699dc. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QM8DG1983155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b74806ceec286a8546b07cabd6483ee0bbb429c1ba0549899b15739713dff9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM8DG1835465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081ebd0b5fc8649732bd4258460510fa1832fe18b5cd8bc77e418615d0d40650. 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/QZH5E2182505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6858dc9e382968cd34e93ceea6c739599e96bf06300a7ee0d83010ba8ac7d14. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZHPJ1937148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd5a40ef53ff01d90be920ef7f48fed717cd81b981d810044498bca703d2542. 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/QM8DG1835404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f6df280c438cc369d5c155f937047117c4ac1411fddbee5074ed2e44451c72. 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/QM8DG1835399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9458a6ece742934e164ea4d91ca976a37029a6c073b8676bbda67cd472c8938b. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:47:16Z), 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/QM8DG1866231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca0d9541c2a4bbad04d56559012649db2ba873c9dd076c10c5b4df8ed9fcdb2. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZFP51911120.