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 0x8184e8024b1f67cec8d9b312864aacdebe1838b7cea77ff11697d594c4cfa028. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56b36b71-0133-4de7-acea-f1428eacd8bf.json and https://artists.proofprofile.net/proofs/artist/56b36b71-0133-4de7-acea-f1428eacd8bf.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 0x8bdc9eecba6d6d222a6b6f7436eb90bb466ee56f5364af0e08c1ddb63fb587f9. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTB22390636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea68ee0496e65f714e1f6751adacc0c71fcd18109ec410cb0133dbfc117a3d96. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTB22390635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a853d475714c340ca68a9179ee8def65a9b9b8fa6309bb1fd21ac6e0bf6a476. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTAZ2361318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a58c0119c4f24e2ef3b862a51f2f95e2772fed536b98d505bcfd5d20f77976f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTAZ2361320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22ef613517ad5678b5b9f384eb895addd92335bd0c110cfe32bb35821c38701. 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/QZTB22390634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30931dd17b90fbe9c776280b494b76b38a16809b2667d9561accbf2be2b68687. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTB22390633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d6cd7930cd4bc99570dd420b7b21bdf5edb2789a42839ddad2f4014e8ae1c8. 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/QZWFH2319838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7f8e67be7dedcd0198d73190b8bdfc3a644bc5cfed2e5eb313dc11f692481a. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZWFH2319839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc737c53e9d800bcc5ed5744be0e3dd2aee38b48436faeec189cbfcebdd0b4f50. 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/QZWFH2319840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69e91d567467219d4b91ef8f45d3b8d2fa660c602e3a6636433e688d981f8e5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZWFH2319842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a55a9ccd56562bf048fbf4be80a229efe075fa3f8ad29c12ba129e1c360654. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWFH2319845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f1b8e04afd305bcda00e21162ba555861f1e36dbcabdff2af6620d34658e82. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFH2319846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee251046570c2249afee890cdbbe488c578ab3f222a70e9f0698be1ac6ff297. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZWFH2319847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d8fc909d99de18a8e6fd7338bd20877d5397479a63fe1195f347c75925638d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZDA82473047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30029a2c6e4abda0dd5682150069c1516d6ad580dc6526e9a0b5e2f72efa964c. 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/QZDA82474499.