thumb|Attic bedroom in Skógar, Iceland thumb|The Poor Poet, by Carl Spitzweg, 1839 (Neue Pinakothek) thumb|Attic in Berlin, Germany An attic (sometimes referred to as a loft) is a space found directl
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 0xc4e0d6cc54bf7463ccdec35096e4c90d9d5c160401aa27553ba68322c75c4205. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90e88c64-c8e4-4bba-9bfd-8f67462ffc8e.json and https://artists.proofprofile.net/proofs/artist/90e88c64-c8e4-4bba-9bfd-8f67462ffc8e.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 0x697b02e130782e206e1195a84e33c13918c178867470d101385bb2cce6fa5c3a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:43:28Z), 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/DENI11200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10195cb226f91c627e1c5b6e2b6da99600f3809b8f0ec6dfae2c2551234f6624. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DENI11200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f636bcb60ebbe85ab0c73c5be65e35f348893a8a6e362fb169d33203e5b8257. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-17T03:20:11Z), 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/DENI11700036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe680a65cb866e129578f3101e4d98f9347763a32526e51a52affad832d07c75. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/DENI11700037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01a6022f0248c720015e69a81d0418b9ac9136f9445788bfde4b653c1219fdc. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:58:48Z), 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/DENI11700038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584fa60809c1a15cc22b4d37448a3886b22b32e800e6fa3e819311ebec9d62c6. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/DENI11700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3537562dca20396998b06dd919e1a99b1e99283bedd2dcc054c66f00de6d7c26. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T11:05:22Z), 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/DENI11700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea9344edfdfb2c58d6812e38802e13b3e4c87550194ffa4bfbcc6efbbebb2b9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DENI11700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d97f2842b3b060327a8e0fb60ae4c9c862b29ca807c2dd3a670fd28fabbd77. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DENI12300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525aa04e7375e1e4db09cfc5541451ac12d1d34983187bf2d18a0ca053b91948. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DENI12300071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0e6ff551492dd12deb07e865734530042549b9d465fdaf99b07ec463d97178. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T08:20:26Z), 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/DENI12300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c899ad60c30a5f74b2af87a5ce96666af85e325f13695608e9e783391b5fdc1. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DENI12300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f15cfc9016fbc461883f8a277f24be80eef2514c03c7d05f8660fbb16f9ea21. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/DENI12300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db9304607c9d3102322b7ab2f5169965cd314d2df079d517b7f1895f8b72ea8. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/DENI12300075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683e265e2493e086c03e5ccff2d6f1b9377acf929ccff95aadd826a8fc27039a. 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/DENI12300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb772a0584f68f1874ec781f5cda13b8a71f09fb5d8274fee64746dfb7da000b0. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T15:46:36Z), 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/DENI12300078.