Toes are the digits of the foot of a tetrapod. Animal species such as cats that walk on their toes are described as being digitigrade. Humans, and other animals that walk on the soles of their feet, a
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 0xd64121fecb4b6371cc48979f1e3293c45b10933951ae99dc5081cb281391b40d. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d1aa772-e311-4e66-8fc6-7d5ffb508526.json and https://artists.proofprofile.net/proofs/artist/3d1aa772-e311-4e66-8fc6-7d5ffb508526.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 0x7c2974c2008c4153a43bb711bda7c2588844ac0d434fde71f249469360e0155e. 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/SE6I32462146.
ur_parents_dont _like_me_anymore.wav - Demo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4ee7ad6e814a3a81495852a03d5330baaa0835319dcebac2be2864c8001fb4. 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/SE6I32462148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8eacfd16a67ae90cc840e2c1fabb3fa0cf30f1575349a1bba75c1f2425d892. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SE6I32462156.
bigtoe and the terrible, horrible, no good, very bad day
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2e4c1ab2c50567fda9d64a968b2dfbc859c22d03656eab573992ffe2cdb856. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZHN32544688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb342cc0d18cb5424d1cf4d68fd8b725b53e5e038349b4531545d050abcc8f756. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:37:32Z), 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/QZHN32544689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0305e67edb494c34ffb9c3ad49eb4020f9e57d8113efbd956b101017ecd04909. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-19T22:46:49Z), 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/QZHN32544690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dc136944c217c70cf7ea51e795d2f4dd3e37e733dafd916ad2cf44315424d5. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:31:53Z), 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/QZWFX2440602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa4b318f07ac044a33332cd13c30f033163a488efb306e0f231e7ff8c42e369. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFX2440603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88362482b5b4bd3ae0bd2df1bd687cc3545bbb9d53cdad64bf55c1cdf7e99851. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZWFX2440601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9f565f7b9d62533eb8ce5339343e849795db31e7dab8d5399288b489a61c36. 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/QZES92542804.