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 0x23d1523f072754e8cabde1856b81dc389eeeb8dea3b4158264bc576120695f0f. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34cf77ae-418b-4a0e-9e96-1ba1c95e5bda.json and https://artists.proofprofile.net/proofs/artist/34cf77ae-418b-4a0e-9e96-1ba1c95e5bda.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 0x4bf4449671b88920d156ca338b8db1e63ac8afca656b389e42054ca1307755be. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US7VG2476395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e75f02f66f509dae239f2de3d6d078732847e35ba0426329e7152fbec4c339e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZ5AB2302360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63beaef50d678f20ff2c03456f32ffd0c440323fc5353e897a40bac6d46ef115. 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/QZW9K2296355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7110de4a2002187823a88c5fd39d2244c31444b8a735adf3edc6e7d97daaa57d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZ5AB2302236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5201d6462abb3898df98df17e0a025ff37bd921f13181860317f7deb737959af. 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/QZW9K2211388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb502b202417e0b5a3726bd295bc388d07737a490fd2180c44003d25c4ee584d3. 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/QZ5AB2303325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfaeba4ae4d71d617ff1ba8d4f9388e53c2708f995417073bddde964dfdb439. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZTPX2287682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b262c122e71c200c1a414cd9eae0e1e2a468b5250d992ad86a61c9defed6a0. 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/QZNJY2278488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee96a945d3e220a3a78caabf883e0cba391dca274d79134041b3e44d3210542. 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/QZNJX2240722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb510b0780f55dddb72c6461989132dab0788ee972c18940a909ccce3ac3023. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMZ92205145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b7c2c5918c4396d16bfa6c4f573198584dfc4dce077d2af66093a5c20dbf83. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNJV2114145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc99529044c0db6a4cc3437de21d4f8b9f4044dbf67bb89da38943518085d487. 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/QZMZ92184168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52356aeac4827bd863d514d271f57c03ce13b188a734e46d720e5c32e6cbf55. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZMZ92174390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e802ecfe664c4b4a311d117933b76505dceb87a48e4ba2765906d7d92c8b799. 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/QZMZ92132137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc93373e4653d3240fa91391ceb72f74f6770e586c27e22a1709a2ca1132500. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZHZ62193088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e58ed5c2ba53ba90895f729f56967c2252af30f2c198b31270d9392cbd96d20. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZHZ62176361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf9c4a1c3d0890423c45a6b01d52a0a7b34f36e27dd80f455d675d85846b4d5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHZ62143063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9bd2ec921b0bfc243dfdd0a9ed9d150d679441fa0fe41056c8564afd1443a5. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZHZ52182538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326695fc88f01a6afd582b8dbb69e81b887c7643c4902fdcb1ad354564c3621b. 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/QZHZ52140929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55de9ea8d83d23c8823a50690771ce850a2562734249574fec9caa3ed968d463. 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/QZHZ52140401.