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 0x448ee9eb6fe09e12965f75c70eb16e0afe4a75e48cd76607bb1fdd1d882ca4c5. 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/f27e8125-20af-4007-80aa-f649f12644d1.json and https://artists.proofprofile.net/proofs/artist/f27e8125-20af-4007-80aa-f649f12644d1.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 0x70fe1f0c35bf93d05de8ad9001d4e38c97028205874ac3a4bd277a5a03328df4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GX3Q92325983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a13d892a76798626ddfafa470f009412c85e804e3ac68f98e13b094eed6a870. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/GX3Q92325974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cd23617cb8965b1424e24212c21df7703cd1557dab10e7df6f217d904e9755. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX3Q92325980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2bf465c2c77e927652ed350b31ba6c4313400fc749945ca9600d0fce20ba09. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GX3Q92325982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b9bc77087f70dec5fda7c94a6155853820d1f851ebf0d4038a16ee9b36109f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GX3Q92327245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49deebaa2bee166c48e436bb8f18ef099cb9875cb813b6aa7fedc0df4dee852d. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/GX3Q92327261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf834ba361631e4ce9c6bf53744d1384887d56cffc5f133e5a79822737e27bef5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX3Q92327244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9c96e010626e4aa4dc4191792d05dd7dd23e90d59ba5830ba8c6ea19943a87. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX3Q92327263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac822721d9542187b623b07adf6840cc4b8f7263886b52ef88c1db7e934b828. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GX3Q92327262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e294d64b71207a9a935a1d88be585226e8d0667eb3e4d0757576a6ca882b54a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GX3Q92331290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4179f09eafcb6ba487c491ad77aab85ea1c44f83054cd87e4d7e3ad05eb643. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX3Q92331292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d527f8798e9cb61d09f8561cedea4ee446d48824a2e10133764e12a69a0965. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GX3Q92332030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf86e3ea9481643a503413f390d097d46e51376dc2707563318d1f6e1351559b. 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/GX3Q92331291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b8293334b4a076faf0a65008413ce227dfd5a93d7812c2b1943b54aa395667. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GX3Q92332031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe23adcbb2c9cab44662def33463bb90fb9c1d6d1dbe3220d63a15d9b30ad1cf. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/GX3Q92337158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d298d1cb369aec3d0103231e5ea465151b21ea03c312ed404f3582779cd5bc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX3Q92337159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda54db7bd0b800fc62f7522d41ee517d53e55deced8ab0b9c5454c882fb5c51f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GX3Q92337160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef37ffa0adafd3a163347632ab9be2b4f928d90270aafc650f2167bf0c23833. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/GX3Q92337157.