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 0x86a91ac048b198748d8439bca4102b017c74b96a0b2c7a79f4a7de3217921805. 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/4cc9dfec-3cb0-4eba-a7a2-3352ced26c30.json and https://artists.proofprofile.net/proofs/artist/4cc9dfec-3cb0-4eba-a7a2-3352ced26c30.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 0xa2c8cfe2f08497974d2f4a2eee09a71a373a54bf8b73b8a5e5eb9b9ae3686b1b. 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/QZYHM2413003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea6350a87934740fb047967a5891e0f697f14d1a935f0efe0b3390187f5166e. 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/QZYHM2413005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d4c6348c640853802ea135e08d1e1fec1520ddafbd2406503f53e3c92cf7a0. 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/QZYHM2413007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0236b5b707f5e744ec57b27a5614200c8240329dc23974dec4afd95d749a082. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZYHM2413009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75418324f35d01198b356a4d0ac86ad7571ee6ae8e091b4c556922aa272e729c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZYHM2413001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea6350a87934740fb047967a5891e0f697f14d1a935f0efe0b3390187f5166e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZYHM2413005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e5ee1e3718fe79abeecb28d4d7c60f4c045e0e8f88a835dbb93e1bd1bae8ab. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZYHM2419142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8658b88d1d39a43a185c0fcf7025eb9ce676a4e811193a6c0c3004a8e0ad0dd9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZYHM2419138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd3d68b8f9e4b537c0fb3a74ea2aa3712bef046c8b9cc74e1c9a2f6e993cfe8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZYHM2419140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a6bcb98f00d831221fef1d93ff7201ecb7028716d8fc3470e4b915f7a85d3b. 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/QZYHM2420239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486deef162e262fb51c0bb2ed3f1b28a9ff533cfc9c43c8c71bde642ac89e285. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZYHM2420241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044ac4bb6976791186023ae08d18cd91b4ec7dba01d6bc77dbd410416c2e9b29. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZYHM2420243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbea56022a4ae322eb05dec08935afe012bf505aa7b90f5e2f3166fb46ec9416. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZYHM2420247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4accaa3db227fe08dc235da4803d844daa7c026b98bf056a7d9f4be0d7c9a9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZYHM2420238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b6b91240a31c9a330ff801c9390d517065cf5a486d0aa21a2309edd7e94db1. 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/QZYHM2420240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d9ae2967aad619cb5ab22a536a2a7092299519783e1657fdbc16109f4461ca. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZYHM2420242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c85a2712c90964398d3d0fbca9013f42f8267cd1735b67e301b43dd7345ed33. 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/QZYHM2420244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b19648be71c743de2f7ef7bacc80aefa791005481f96c4cd276f6822278f9c. 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/QZYHM2420246.