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 0x4b0b1bacde8170f55d5324d0d5e1b20f1d2b2b89debec8d18cf03309bfe2cf27. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22d2f9c2-5902-40ba-be00-084e2bf5cb74.json and https://artists.proofprofile.net/proofs/artist/22d2f9c2-5902-40ba-be00-084e2bf5cb74.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 0x10e6913571087a15deea9c0e7f73e6acb8f05992843382b4996c453210d1f9e8. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAIE2414443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fd551b663204e6f7a714b0b3f9b2683997d94be7c1a84f8c6077dbccfb4308. 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/TCAIE2414449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934bb692054a6281576a69195f0c8af3486cc3d39632c2260c661d09b844ac09. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCAIE2414452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72220b29c05f0660d777faf5f84395ca79b12c000234a08bec1f6f3ac259b2c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAIE2414454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1181a4f1492b61bb97c43f44df0d0cf40dffbe51714c2051ff6258af5276367c. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/TCAIE2414456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76778fe83d64a889370763294e5a53e1b1019f6c97f5994aeb3512702ead922. 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/TCAIF2414461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9be333a1e6c5f0d2d6fdf931f36d8b1e553c85041f2cc6f84ad5b0f78e440ab. 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/TCAIB2499340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344265f796c1cb2f61e4bb16dfc96cd0c5a57ab635902a6b16ea6023fb15f4c3. 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/TCAIN2443024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca680e50853a7121a4305ef4548eb885af34e56e4292282247c0f94cc98588d1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAIN2443028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243eee77e4b226dc5225288417d9fbca1cbedb5805a909997b711e73f9d39812. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAIP2443032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d54183493717f33ef7da558021f7ab1a4b7fae405edeb7a39165f9088e3189. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCAIO2443036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a947d95b37b9998dd7c3775c0fbf97a0322e5daaefa269304b19152d1c23369. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAIO2443045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c4ec26c3e876457816beca901d16f5386dd934ee0f105bc62f622db3eab7c4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAIN2443049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8fcbf376539fc66db10dcf7d0dbf23702693f98b58b33fd2a602cd6321b0a8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAIN2452337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ecec908e0097a1855751379ff1a20acac7708e50aafc40035298eaed378ec3. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAIN2452343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45847991b7fb50432c7e6029b87594cc31ad29e1ec7fd39b5465d8d83027e7c7. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/TCAIO2452347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47a54d436c43f2a465f3c2ebc17a93529f19c4645813ea0877344b6033e73cc. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCAIO2452353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe4999a43ea90af433c995ae19a6c71b4c43c6be762f75ec0117ee21489dd93. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAIN2452354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63fb3152fe7309013b3126840d64c778445233e4c3acf0a2a021ba5c570070c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAIO2452360.