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 0xcacb6db7a04c99b03bd5f4c48ba4923b149c98f68677dc415deaaf5356bf99b3. 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/fc19cec9-080f-47c4-958b-844065d28b31.json and https://artists.proofprofile.net/proofs/artist/fc19cec9-080f-47c4-958b-844065d28b31.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 0x608f4c33e87402395a5dafcbb824fbf57e5791d2e7c8e3eea449e3353968887b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6L2347634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8118e0f346f0079673baa0f7c116c98e3dff0a831f3f0499ada657b8a6e8678a. 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/QZWFK2356625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a7fb239ecd97a3c7da806dcb714a276c9b1fcc5a0d83d78691921ba6298d19. 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/QZHN82443867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011533824ef3538b9992f3509ce0fa66e8a7fc508c53637a33dda62db813f096. 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/QZK6P2471687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90079eac0790ef9f1e74b320441c1d13f5ad377c934e408adf878955ad6e142. 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/QZK6G2436640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c40322045961d818978e9f067245646b6710b38dac5dec5cc72901863444074. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZNWU2490880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4638ecfe6092824c86f7b3387e86ffdb4ac9355ea2b669c1c0918e8fb7160dd4. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTAZ2484241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eca0fce9b70cb9ad6de63996695a0181783ed9dee1baf7a1347bfd32f2b71ea. 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/QZWFF2404383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf088ae89f7cd4c2f99039372117ea5eaf4b50abe7399d144e869abb7e8c96fd8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZN882586333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c27aa235fd005a33c39d11c773b70051a9e3c0983ac75ce5f40f37c79101da2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2309621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd30aa784f4a827a7269a373e040940943111f9a2aeb89aeacff32dc098fb7. 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/QZNJW2470095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30b13a96fe275a3f33e6f3f7b5bb121533cd0e1ea7fc997a4aa576e42acb279. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZMER2304009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc987084259903537a1157f18fe16572435621271e150ba3a0bf70708d304f177. 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/QZDA52499533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a7f0d5561016d12dc7d296ea466d1cbe1f7677213b8a22b27a05c198edb572. 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/USA2P2400554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50cad5db79135a452a1d761deeb8adc5672549ed844443977bd005613f87d70. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA52097243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671ea6214584a91cd1c3aa17f2142724bf5358c0c072ab6d5cb34583964d00e9. 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/QZDA52097246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ca785fe5fff19618ff169dc5476eb59ea55edfcc21fbd340e2a8cc3d4daeef. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZDA52097247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e17d573a68514648815f2a69387696150f2719c7cbd7b66ff5d969688d16f7. 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/QZDA52097248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3f948025ea6d99ee6a260d3919e21e8a44a819163fa0f6b01aba7f4af0cc0a. 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/QZDA52097250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe84a33eeebc788826554346b122b07dbdb2a2c39eef73a8dd3e61f020fe938d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZDA52097251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6207d35b2d1f1e142561d0ceb780e915abf6c3b5c7627dad3e348b6ecd1cb0ea. 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/QZNWS2372171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9edfe6077ddca11b84b5e662cdbf9405c7c495cfc21eca303ceecfafd56c10. 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/QZNWS2355681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285b0a0d1dcab378b5c7f513842d9d284a29d27ccc5efd32ee25d367b9619281. 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/QZK6P2313511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d90872dbeeb00ce62d98320c0242c637dfd17d7f7781a8a2ac0902d7debf9c. 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/QZK6Q2339593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a1a9d2843a910ba142bd557325be8510fa3db6b63b7586eda5519af44d48e9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ42231836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdc3ddc39e14ecdcbc6b7bca2e15f07947a9e40907c72bf271d6db279cd4f4b. 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/QZFYZ2119227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa719782213020bfb9c72799fe689b333552a21052f8024500278a6f673b524b6. 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/QZES62453912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2203260952dea7bee3ad356725449ed1a65252be9e2bd6b61a93aeff3ae0678b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWV2348241.