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 0x192feb7f33eb95d607b75d4bb5775a59b19a78c6149a693519febbbe9b323f89. 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/9adaa249-2d5b-4e31-8827-6643bc64a2da.json and https://artists.proofprofile.net/proofs/artist/9adaa249-2d5b-4e31-8827-6643bc64a2da.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 0x5cd0d0ebb5d9d5116beb939af75094dfbee71ee0ff46a2215f72d7cfa50d5d51. 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/QZES51938575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcf1985ee1f7df4d29d867e742ba6348f789b621a5344be738e67eeee991917. 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/QZFYY1944822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f70549a02ad4de61ce5054631bbba7c03a984dc400969409357b2e40662a0fc. 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/GBKQU2033528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea693f5560cfa4196ec25acea1aec1247f8f4526d44784ca51620d23b9e51e26. 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/US3DF2004381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa683ff77663cc6d9e178a4b9a052f4bcc25125ff37992d468f002d6de03aa5b8. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USANG2129370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde442d0ed5d41541e5c267924ebcf1dbfef1ac8e452dd9597dd4a2bd1b82dc03. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/USANG2132646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3dc626cdd9a012a5147fdc3a7ba69ae33c1098af483f1de3f3ead2b01b2cee. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/USANG2132647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cac359d25615f96886a26e74bbb45955bcdaffa65d4462211ea41c212d99d2b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USANG2132747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf251777f259b0f7ad85cc8efac2e6aff38960bc0bb2386dee7058ff1e56ffff9. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USANG2132748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d14e24fb32bc703a6d9c85de813db3b3e67922b3f7929fcfdaf44113030054. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USANG2132749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e8ec3ba0a10e8a2d787d6e84c226b8983304a0e97bc1b489ed61e502dacc7e. 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/QM3DF2112772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43023eaabc01c1fa0be0a88b88abbea28b5f95da526125cf265ddc827fb0199. 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/BX1292100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59d9c67200045d36f814893d784dac3150e58f378cb4f85ec0ad886cac22c5b. 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/BX1292100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15af34a49bae8a6bfdab30f6bcb4572a29143ca1db7cf3f57ea9896ce5c3535. 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/BX1292100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9427cc91310c5d1e040382a2530928c63c4f78c12a6f4b277c9473b9140c0c6a. 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/GBKQU2068343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ab3d50e064af70ef0dd8181b287ffdf0fb82e3bc6b70515fba92624f572c14. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/TCAEN1975524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9602d436ee0c50a5352af2f6540f8e39dad010cc365526fe1577c0f8538e2d95. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ41917522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3803f78548072c3b88d7405329f5356c1fd3bbba7d1e0e1898a9932564adf82. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZES81951107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa781c3ef8b619847970479d9e28d0ab2e1f613619489cee026a4586d85ae56. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA41984808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90f5ad541aeeadb469893770bdeac7d1b303d60a2a0f9a4c251c07551de1638. 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/QZDA41967903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f17b7074d28d93474ee416d6eb04d80abc10c65c65ae3e90883739d28f14a33. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/US3DF2484770.