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 0xfa670bffca9ff8ac2791fc33b244b54adfcde432452da90d35e9fb534e8877f7. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f9eccd3-64a3-466f-bcdf-df035616a2f8.json and https://artists.proofprofile.net/proofs/artist/0f9eccd3-64a3-466f-bcdf-df035616a2f8.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 0x67dbab844e679f8f27ab353194f25b468d2cdcce4068fda73675b2107ae06529. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHNB2125901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973e51485a1e31da82a1b8e46bc588e8eb23ccd999cb84b34b70b49974fb88fe. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZHNB2247963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b184d6bdbcc3def5f10f947ffbe30b34c8240b351284f87afe92a1c5fe69373. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHNB2247964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3d95016724cee3cd90ed9af01e4a7c58a5a40a66daa390b20a4345d7c0043a. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/QZHNB2247965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca44b8da2c3d5e1e56bcbaa8e69bea352223c08e366b3a9c266c50c42018376c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHNB2247966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0d7ab4662572eae03a30df68987fe64c32f0c68c29dd80fc09a575188be059. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/QZHNB2247967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cb12099f4df778a2aba1b1327b6d0b3da3b9cfdacb13d958783c6c0b9298db. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHNB2244125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5b4e90e80723c0dd4d8e0f4f76640adbab73570e2589fe8871f38ddeb96bc2. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHNB2247969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac24c7ab81a1231a7351c31b811f69c701c43e3e76ce1959d5d8e23c21128571. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEN2366072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955d0df19e8f2044c8f6f13931a6b6558be60ec2309c98353384c94be01f3731. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/SE5752352445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab25b02eab333c59669da1a77e9d68b139fba1115640ee7d89ed3b9a3f63108d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE5BU2341501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83df320363048b04d1e1d4daeeaf49d88cfdd01a293e2371df9273a7a62c6d0. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/SE62M2219646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de3930cdfad6bc42acec70aca0976761d03a6c3df3613f38f07ffabf7610dd3. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHNB2249795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886d63a677fa21fb45944f9f33b84677f3e76f916b20539c78a4b7c72f2aea57. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHNB2249077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe489809a9b2e9b2f061531c4a02a0fc05df101a6e5e02b7d2a6340633dd0740c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN52255033.