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 0x614cfa857f4a2d15da97ed96dfea0b369e00c0e940e9b6c27f8b6d2cb41e1a34. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c65d5b02-212f-4883-a4a1-28afd93f53c3.json and https://artists.proofprofile.net/proofs/artist/c65d5b02-212f-4883-a4a1-28afd93f53c3.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 0x65a153cb4356c2e4d096e0d92b833282bca6c6b63208b7ad60b805c7199d84ab. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCACK1560972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99517632ad1b040f4c05cdf7599e480a79407c3994e0d110ca38efddf43f8d02. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCACK1560973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd062a10ea1151c267271fc75849c02ce6d86ccfabb926427812fae5de3ef8d. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCACK1560974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71c4f3973ca149f0c3537593c3195d85d28fac32e351230208f3128c1a8fd6f. 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/TCACK1560976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0075e9516fb023a95451de19540962b3cc821748185501d126be24acfab80629. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCACK1560977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1e163f09c941f69c6f1bedf7fb035551cebe54ad2dcb4dcdd50e05c9256d18. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCACK1560978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60354cdc8d93ef44f3e3e8afbb1158a57f24f633187267723b8893a8eb5640f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCACK1560979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f029fa0c8d95fc24c5f3a3d8d39f939eb56f0132d53513f48ac4d5b65af7e07. 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/TCACQ1612738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bcc19d3011b04f9db4c16011a19e8e18b76c4173aa30381b31c9a5eccec2f6. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCACF1563467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765311c47948ebfe68e3d0c21deea1dbaa06e5c38eb18f8f3c26983ed3fc3859. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCACF1563502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b6bf968cf5ba24046cdeb2322524b3c68e67f37cbc1f2b658228795e0f4785. 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/TCABQ1310640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cb466933fe4d16dc4ff5db0c759c6979e328854cc170ee8e52d84b023755bd. 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/TCABQ1310654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b70f8095867746887444ea7633027f4fcc462703093100011482a26db43d573. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAFG2032171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cf4f64a543127491f373c600264e0a10e2cf1cddf75e6d527970f8c21df11c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAEF1997077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87abc5f9ead4c6d5592186577f2688b11a3f34755db14d6b8cd0f15bf6a8955. 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/USUYG1238991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924d6f372f18e1b52b350c27b03776ff37b1f8d04d3837dea75622c63ecfb168. 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/TCADE1711195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81af78a55c43e4de9bd41b4e28bd017cecc084f7c315c890ad93540d04917c2d. 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/TCABR1383534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01608c11bf32ad9c2d85b4f3be4d6a6989a5810446a2e996a47fc38ba531fec2. 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/TCABI1286805.