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 0x124b6272370828b3b4d86ba46eb8d30a2ef869f2508a72d325fff35d94475601. 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/8b71f502-d5fa-487e-ba29-0d2819a36b61.json and https://artists.proofprofile.net/proofs/artist/8b71f502-d5fa-487e-ba29-0d2819a36b61.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 0xed07e6b045eb54ba9706ea47a877ee7e091f3cf41c947f097d8e1f7eb898e6bc. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZFYY2262873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef554685864f90c260c4f14787f7c96ef3b373a52a6f5b149c61b505a182be1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFYZ2227005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e1824e74f108b27cc921cde66a770311fa13c932627ef123216ca8a185a8fb. 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/QZDA42226061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e12d8fc4bdd1cdf60aa25ad72086ff01be643d2f2fb66bdf369804133f5a455. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZDA82253090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb38685d7a62b0bda23e0c8c890ff32d05517b04cc1299158085da3cb87e40d9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES52244399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322263da10fab2809023b668ea73bc9891b1198dc9889308c355503ab925ba10. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZHNA2281871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad53f2f6e4005e17ca2c508055c953c37759c43841e966f7c24b53eedacf5c6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR10S2400908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7b9f43f56e54e6fe3a410ca822a7e16e6304fed5d5034403e6e8aca25e5c3c. 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/QZK6L2214739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf578cc2644e17309d7e920c5d84a49c7b87d9efc3d8b5074a12552436ec595d6. 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/FR10S2400898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfd940a26b0a6a95abfe37622e5a044e9e469ecb4be36e017bdc207894c4404. 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/QZNWV2249339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26234e77dea3cc4b0a18b1884eff00b6b7af41adb26c9b8f675444682ad8b5fa. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNWZ2218519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80aa4ba2337139d4d3f799e119d9c8371df2e708e2b4a585391c61fd83435de1. 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/QZTAX2226738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57399c4cc27ba8c019c76e66a0a74de462c7f2c94d4a453392b04b342e6f203. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZTAY2274741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd358b2b4c51b0d5d7b7fe6c4f18813d7e87a3465efe71b1ed3c082c916f41ba. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZTB32292072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f51367118a9996791b14fb545f3d4401dc4118eb223945f2276f5129b15dba3. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZTB42220810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c7387cfd752d0f976b8ee6e10193616337e54a741855b622c64f929dfc4e02. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZK6H2346603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ccfdc3cbbcb6da0bfd983e4a39eff2e0f01d6e30e15959cf4be8c94fd52e5e. 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/QZRP42247040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7793f0bec2d35014626d593704bd2e68b668664091e3910b326dfda19bed68. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/DGA062365580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709dfc34cb868b6455cc3788550bdee2bea79df8324b2fb52b7ffb5cd7ad7f4e. 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/FR59R2504868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898d8b1216002ceb785fb287e147c13b5b5fa5476c0e2b531e8cb39768cb6318. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZWFL2342133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99b8796d84aae7a17f22f76e35b2ec6867c52ec466d063a3d193ebc90ba69f2. 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/FR10S2461875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a743a7c382e843d91204a506416da06c3230e02ccea9572d6055d30f27cb2e7. 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/FR59R2581441.