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 0xf4b72d56b95e9f51ccfb79fddf94c885bfba16eb44d89e64745c511f55598e2d. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d6d4643-750d-4e75-ae7b-8be5e8f695a8.json and https://artists.proofprofile.net/proofs/artist/0d6d4643-750d-4e75-ae7b-8be5e8f695a8.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 0x6e34981248ce29215742036468845386740989dc78666416c66d3709310a464a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZMEQ2029566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429c6d694804c8199d6feb12354c6ff5d3302bf00ee548765698571b97a8c810. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWV2041427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb375a500a21763d17791de56d536a7691c581c74b536ded9edba2724c96f6989. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/CZUM72100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd712162eceba7d1c6b4424469b50cb4fd038ae3f3a990d418b98bfdd328c398c. 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/CZUM72100477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925908c4a8534e3c48475384c6d689c8888cdfecfab5f004d3b2e377cbb479d0. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/CZUM72200520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533bce693e079c3b1cbf891e602db0de5e0ee48f410095ab403f2351ea50baec. 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/CZUM72300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578b3d35e84e4b03690a26e6ea83bed399ff67545b8e0b9faca10e011edd62bc. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/CZUM72300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1437bca1fc1a8d580e1eacbe80d7f67c2795dba47f58c07163f629ae77c44d34. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/CZUM72201221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c2c58f136ad4bcd3a8cecfcdb2fcb9ebd523923b92f65cabf8417dcf61921c. 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/CZUM72300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27eda6253d8ff6b63385dc6cb07b1e783aa8fa458746b512dacf8649e2693d6b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CZUM72300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9dce01c0dd94998ebc34bcd2a6cc866f4e2bdc4f12204a112134841725f8ec. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CZUM72301563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7179aa1f606660a94591fd0b8fe028cd4cd0b3a06e499addf08cc87835535477. 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/CZUM72400347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e87f22aa3634b27b5eef17836702d3136a1c0d7a0f1575863111e9a70a3eda. 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/CZUM72400348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72175af65e9925c0e2937f473731623ecf99322831453878dc18303cdb5b328. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZUM72400349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd544f0a8ce91b1f0d2de532e5782deac8f4ed318f885d89ddded3b226ef41426. 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/CZUM72400360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9dce01c0dd94998ebc34bcd2a6cc866f4e2bdc4f12204a112134841725f8ec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CZUM72301563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8503dcabc07c54a53a5d3c46f98326ed3783dc812e4e07e34df5b109acd31af. 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/CZUM72401214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7abd082e2a104cb41550b6ed69c4b9a04cddeb8f68df56bffd75e9cc80922de. 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/CZUM72401216.