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 0x62042ee20233f30285d7b64793a9b2398d96d84b53a161d6061eb0a1c0d03ed3. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb5423ad-c7e7-45a8-a096-f5995600607c.json and https://artists.proofprofile.net/proofs/artist/bb5423ad-c7e7-45a8-a096-f5995600607c.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 0x0e39cf1e1a353b243222545685836f451ca5b02fdbbe55c4da356f38e5785aa9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBLV62215150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2194c9e049a9e6d8164554d1d24c4b5fdd7c72bd48499f7c497460799f2a096. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS662104380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee58ec6aef40cc8e67c94349fdcad9cf6986a2e6c3eb878558b756c4128c395a. 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/QZS652194133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bcc3f2f40a9ff900e6222ed8f58d277b583f805fbe41f6d771dac08c65b049. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEK601987009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19cf983a3cea3b608f4207e4c98afe5fdb7057f38c3d8067c2abd0a4600e5a9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEK601987010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ea34b68cbdcbe1a2680a4809a4355faf8b3db1d247b1bdf9673afea5389c08. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEK601987011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d5f63d3a9f6b2b764c4a97522bafd67c8d702a930365ded0b7eb63114f571a. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEK601987012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef198001e62891cf03b1c2caeede2effa4f1bbf7be66dffb4a90e342bae15915. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKQU1971955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63961ea3e6b215d0745193327e2dc01d49ca5c5621dee6be5440f732085e77d3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU1971956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb655d7e94cb9d97bbe20bf6039d1217bcb6ea9e5867f7fc42932db8973a693d. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GBKQU1971957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df6db71c8fbe2643657de61f9bf3a7a81e22165e2f059dac75434de2f87905a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU1971958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7672b35c42374d67325eeb975bf18ded74db6e20ea8b2a2a65400207ff60cb45. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM42K2140545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e1a8f5b8ba544aab76d700a44a8476d86ac6d9c8cc9c63249602ee6ca71df6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZKDK2178809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ae02879591a971dbe9a1e7677839e14c3f2b5a3494eea37d5e8241806f0e93. 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/GBLV61806330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9893156badd40de0b1a9161d8fc2d5b56f46ce91cbcda54b157949770a0d6d0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLV61806331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd092016fab0ab1a79ffebbb8709cd95c0a46a50487e9e6ca8ee25cdebd5d01. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEK601786001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e39cf1e1a353b243222545685836f451ca5b02fdbbe55c4da356f38e5785aa9. 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/GBLV62215150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b4548614519bcbeab1b6bb576810048af2ae7f8cf72a736c250bb7fc7fdd48. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FR59R1937769.