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 0xb10a94a05f488aa70402a2e6c7200c91ab5a21efb14afbf3e9c951f455bd8b65. 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/faded372-5dd8-4324-adae-e8ef8ac7951d.json and https://artists.proofprofile.net/proofs/artist/faded372-5dd8-4324-adae-e8ef8ac7951d.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 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 0x57a419bb92cfa3c3d7af6b1b2be792d6696499d5205d0f1bf6bb61a275cc5975. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NOUJW1713001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48669cfac025825ee4fa8d3f793df5d169027b6b0432fff054469d2fd5a19950. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NOUJW1504007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45400c32021358f74c809162f647b81057ab23263659dd55e92bb8bbe665199. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd358bbddd68fb018f96345213935cc32022064d3d0b58815c56a8aa8ba587fa9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714f3e9359b5d3d26c963319237ad24a7c20e528cef462fbd4dc21e82dd47146. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0629fded4b6747d1f97fc0f8b1113d89f335ffbd908529683ff76c8419defb3b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CH6542019089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf9de2c2fac918b67323a112e2257a9792d327bfd8019d5c3389283a2e17df6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7292073cc01b79d2009e3bc4ec5897204fa2949dc163331e194375a48a248a1d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH6542019087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455e60bfee3776a203c5398d2c45d3e630f48650a3d93df323ca643b81d95c6e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5209c7d94db6246fad61bf2b9e26496a7ab5b504a65cc7da65323c91f3d882. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d85626782c2d5d41e29497b478f1a480fde6c0b9f0e2640ac58f14a98ace67. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CH6542019083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d67066f11ea508411b8f078377a061382ee5b2fba47111e63253a57f581233. 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/CH6542019082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde262a01bd9a70ec8747babfa130d6600a6466dcc27a2bd871b6dc5fcb0a953. 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/CH6542019081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543a0c7d4c33443b4479875e1ed363bcee82189c50c688c777c87ab6aeb199e1. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/CH6542019080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e18e99cc9e7f11b78d5bac198d6c1af49be413c69fd2e42a934cf8bc90e01d3. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CH6542019079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5ee01b3ca305d881dd6f957220295f179b8ea2ac1f43023828a1d7270a84f6. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/CH6542019078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc791030269fc1c70f1339297e737aefefa66265c962d1eeda24f299d17cba53. 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/CH6542019077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a616c4968094b39d7aba1b9074a81564a759ad6ca5ed58985bb5b28849cf1a. 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/CH6542019076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b661d16cb416040fb9bf3afa3369025c2d2b5bc3b1f20a0236fe4c58e06780c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH6542019075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b63f70f094a39bf0c2814f1438c74dfe29d6274cd95782a8a04f9a40178fce. 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/CH6542019074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3842ec73eb497b46d67379f6b1764f8fdaa09e5a59fb51feb2daabba22d86b3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH6542019073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27573b5556baf101927f2406c8ae0ea14377d2eec4314b93466fbd3d198e4770. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/CH6542019072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5df2958a49dd2c6c083b40d4c6d6ce5d0401569a3051d2b7efb21cc047fa69. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH6542019071.
Sleeping Noises of the City for Calm Sleep