thumb|People using American Sign Language thumb|thumbtime=5|Preservation of the Sign Language, George W. Veditz (1913) Sign languages (also known as signed languages) are languages that use the visua
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 0x6bf3649ff41637ec5679006c17b363057544bac20adb7bb218a89fa44ccdbaa4. 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/2b7dd170-6316-427f-9637-7e3ea8ef541a.json and https://artists.proofprofile.net/proofs/artist/2b7dd170-6316-427f-9637-7e3ea8ef541a.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 0x398d8b3108fe39f0c442980b36c685c009ab11a3498872cf920247222aad3a2f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZK6M2049556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97728ebddfe9d3f24c120c95a4b218bef03edad87c3a37bb094e360c12c47b1. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZK6M2049557.
I Feel So Undone / I Know It's Temporary
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f8e381afe0f9844beb639a3ea58c3251bab51f71a733d990b1c4f6e4c048e9. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZMEM2093524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24185df1fc9f7c170e03bb5388281ad696dd0b3f2aabd3f94fdcaaaeaf4a17a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAU2184724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b1e4e2b9b55fe3888c56d564251b67b73501bb3830625c393c3156bba12e72. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTAU2184068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e59c709cfefc5b0708b2c615c26722034c9b6d4dcacf58dc75fb2967f1030ed. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QM4TX2306306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd785d55a2a31a5e6a8d30dddfa73085ad277364bbd5b9febb7efae5c6f8b6dbd. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QM4TX2306299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28363a6de77821ded07dfa9062d96a41e4fee207ad8e90fd39b4cde30c0a1dc. 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/QM4TX2306302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f46dc74f6bcc8df64b2b09969539040412aef9933cdf70e24108d692903a076. 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/QM4TX2306305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f87864d0b890ff1518a00b11d11468055a9da2b0cdafa29077c3ffb1293916. 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/QM4TX2306307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced05cc9db4b74766c6a1f6fa0373d75ab3c9f277cbc8498ba1d1461fc41cfdf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM4TX2306308.