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 0xc6a99bcad3d01116b50062cf8882ddd45d4e9599e507d16779e372d841a188fc. 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/b37a7b14-5ec9-4409-ba28-861b44c716b1.json and https://artists.proofprofile.net/proofs/artist/b37a7b14-5ec9-4409-ba28-861b44c716b1.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 0x599769487c9099cd958c66c85515a03a8acb162de80e3fde35bfea7316136ae5. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USCGH2218394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5d818d68aa14845204a93d83266c84368469071cb7f8dff44aa563a1fcd510. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USCGJ2223343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5d818d68aa14845204a93d83266c84368469071cb7f8dff44aa563a1fcd510. 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/USCGJ2223343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512f77a70c6a0604d1539f200d2f128353cb275b83d4c22d916a0fb0cd8df196. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/INT132200660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31b27e3cd1f1fb0203fe8ec47770e4a91dc69f4b1b00dc52fae520927c12053. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/INT132300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633253b63616f883059b0ab940bb57953013171ea568f9683b0c1e8b7a50ff4e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAGY2383740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09636dcbb49c8fc1010e618531b5d5374bb009b5d25bf1a2f65792d49132aacc. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/INUM72301541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf182e24dd81ecde7e6e195218bd04872a5010a9cc86456bfe083f80389dbc23c. 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/INUM72302314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8402df474e7d1012e26b55227725ceaa72f62bae237952718429975f8cde18. 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/INUM72303172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf182e24dd81ecde7e6e195218bd04872a5010a9cc86456bfe083f80389dbc23c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/INUM72302314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8670ef0542be6652544d55b03ca02146d00fe65743feb52407f67214551ac5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USHM82309827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37b1734f44564f4d70f50e8ab3fff01ff45b698169cbaf6281bee0f6e4dc3a7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHM22351160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09636dcbb49c8fc1010e618531b5d5374bb009b5d25bf1a2f65792d49132aacc. 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/INUM72301541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb04f3ef9f5630d5994de19a99b84302e04a3e8a1ef441e44ef90e08c72518a. 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/INUM72302893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122c519d51144c007bd25c24ae0e66dbde2b8b59cde069a7b59a44d22d01030. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/INUM72303197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968ff9ae1aebbe4884cc4a883b4804dc73365b005c4a91090116cb27c5f501da. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/INUM72500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8314cd43b69969e06ea46a640e894eec9c201cb99b2ad7612747044228157956. 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/INUM72500057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722e3fb7d9f8c7d2c8052d5f001806b57ff4e05df472fd95cea99dd3b4e2c748. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS182403116.