The Underdark is a fictional setting which has appeared in Dungeons & Dragons role-playing campaigns and Dungeons & Dragons-based fiction books, including the Legend of Drizzt series by R. A. Salvator
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 0xaba4e1334f8dfcb268ef36dc287f9a018576794b0c700e0921bfcf4e8663a673. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc54c141-95ae-493c-89b2-860b5ef48e44.json and https://artists.proofprofile.net/proofs/artist/cc54c141-95ae-493c-89b2-860b5ef48e44.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Past We Inherit, The Future We Build
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 0x2abef978c50dec7d60113cad9b393961870e337a2f6b4c1abbe260fd8edb453a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GX34M2100240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb450c2c47cda9c01a2637a4303beba6eafdc95bbf6d3e87ee78a18562086f1a5. 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/GX34M2100241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25193fd04ebcdd6bcb6f61081889ef1455b96faefbe2e29e4d4bc0a3fc7e7d36. 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/GX34M2100242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8aea3252d0c2acd69864b57985eb20a548ce84ae2e2294cf4c2abf10310440. 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/GX34M2100243.
Raised For A World That No Longer Exists
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf23aa2b7e86c8489993ad3dde3a55e585757de1ef93d3e6dfad6d18baf1282. 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/GX34M2100244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa742635fde74ef7b160766096f01559d27abe7bdec73915113b38c25939fb3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GX34M2100245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b0d8081d2fd741f4b61aa17b2e01ecc8348088e807305240ba1fd060fe7861. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GX34M2100246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22e2c95f4a4d93eb7cbfbbb0def9dc671b69575419f79cccdd8b49935d8b6e2. 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/QM6N22165638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4767a805e766761e2cb7c52182afba6481d21178c653d002035ed50a4ac455. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QM6N22165639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b02b12e292b59b8c4a625f3ce4506ffedbf5acef9455cf1fed0a5eedaa96eb6. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QM6N22165640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e382eae5012109ea0bf9ba3c400f16498d7d73a3f1cde52af4e4cfebd177da9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6N22165641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897667e4aa34b1984aff5da0d4bce8324cd90c028d390eaa2d65070cc8253d72. 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/QM6N22165642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45dca1a6b42aea4b6d8eb6530d231c45ac2e35ed2a5b799deb647fbb11b4b0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA052310880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b02b12e292b59b8c4a625f3ce4506ffedbf5acef9455cf1fed0a5eedaa96eb6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6N22165640.
Plainsong / With Bruised & Bloodied Feet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607e3fe3b08afa4abf61a84056e2257997746e5ca551c3989d41776a522ac4e8. 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/QMBZ92032844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981324bdea9cbd415961a19f6f6b1e92a715be3ef6d89f4dcfd72e5cd73f8a7c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMBZ92032843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f0bdfb0f18065ccc7d3fd3075efb3988c3e2b1dca010c85a6b7130f98e21ac. 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/GBLLT1802946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b55e29010af748de504c1ab6fcc377a267d0febbb7ad4250f55c61f3e1c571. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLLT1611897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ea951b23115b9c77053f67367251145f47be90dd8809a953a0f8e9e75a6426. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/GBLLT1611898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f386936fd3b0f6eecf4b0c306d4ef279fce661f078d89ada24d9e0ae19594f1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBLLT1611899.