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 0x973b53c683f3e3f4d197848244923f5052086c5960a3a6ca5658ebeeb963177f. 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/ccc5995a-4540-4243-bd6a-0293a5106e1c.json and https://artists.proofprofile.net/proofs/artist/ccc5995a-4540-4243-bd6a-0293a5106e1c.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 0x6e012379defa0611bb5a95310516c06e85000093553cc0a03d6dbfd4cba1c9fe. 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/QZTB72224053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae45ab03760cbfbcb21b8a7babb0265df8f786048e0b1e7d5db473e628009a70. 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/QZK6H2062879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba14e685cbeb58d0935d88ed44a87abe73fa55b91b7ba3c59b74078eb62ab1e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZK6H2062896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44157ed9b73571cec5e3fda6ea9418ad0dc90255a17f7682c8ac68add8f34b4e. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZK6H2062897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06693ffdc60280482d64c5338ee4b40c10b5d8ec3d7748c2eadc4c8d37c6115. 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/QZFZ61951496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d36f3e088a82a2d6e68a4624729d77a4d30fa5cbf9c5db0c16b62326f3faab. 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/QZFZ61951497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017349949afdee0987a14a8cf7f0b6352b89908a91ed3581ba16520de9910a0a. 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/QZFZ61951499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765dc2db1031f92f4e9d4cb6e44e5a3941e88da2092eea00fb68efcb2b765e79. 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/QZFZ32081937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87cefe9957d9fd2be8a6a18bfe322e6b5e5e0a1fd7a709a425653bd55194fe7. 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/QZFZ32081945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fde558a1a66dc8fe280774414ef943cd76f5a48a15382cfaf82971d707b3535. 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/QZHN42174932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304a6ca36991f09902ce6a142f3a3cca883f4f903485a93150a63f2c7449bde8. 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/QZDA62072086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8108854172ccc987fa4c4ab2291fc531aeee7743e888611270a649847a93b90f. 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/QZHN81956146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5a1e0ee1d549e236c46968f717357c617be99b0a8135b24fb7974d5c8be3fa. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZMEN2146343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f5b0b1adbae8d0bab7248ca7e3a8a57c14482d197a1eaa48ea1277cbef0856. 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/QZTB82441583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7cd193d7038f92f1fbccfe33674c5d6385f9da35e09971be338a98c6bd611f. 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/QZWFW2499587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058d8eb91d2ac2ee1ce639e67680f9d1d71490879bf921a0c65fcf1b3e477001. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZNWW2364849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ec534f2e8230f709ea5c302de04165dfe208c078fc3126fd61e12d03ee8a0f. 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/QZWFW2499588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35509e22982485584f14340d4430673f761431a6d3399939cda027a559fa5ffb. 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/QZWFW2499589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020e864431b0a54a3df271df5f658b9174de4966a311c76c5420a1c6251985dc. 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/QZWFW2499590.