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 0x1338b20a75c22ade7dc2937d0fdea3b8d5efad701fda9413b1f40741942c0240. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/397ddabc-2eaf-4cef-8170-9eb702ed5f0e.json and https://artists.proofprofile.net/proofs/artist/397ddabc-2eaf-4cef-8170-9eb702ed5f0e.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 0xcd097b79250dafb07ca8ae4346dffdb33f60bbe3b7d89936b05a0e152f1d8a25. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMFME2088777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e2b5ef7623c8542f8ca964d55457b9211241059a83f7087ac847c77f69d108. 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/QM4TW2039238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf665797c6876bc22f7ccced11460c87b733c77d194ba09bc8720c5d4f6c3a6d5. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QM7281871678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e84c99c620dc2143ed97ac56b24af65d945c0c991d9ce5b4e29eebbf0792ec. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QM7281871744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4748b75b68fb43b4f6aabfcb7012f7bef78aa68e090647757836584375817be6. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QM7281871800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0f1222ad5ef2d03c6959bcdb60765d774b15e6d89ba7496108b375c366035d. 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/QM4TX1809251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88aaa3a8266e3519c65171a4aea7fa30f3c9dcd3176dc0eff702acb0e78df912. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM4TX1809253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360754e3b9999b07b9520277a5c4acdf14333240b49e55ca3b8e93aaae90979e. 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/QM6N21735690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2584a67ff53c05ab50f4193d38f2b81a2a362a61cee7972a0d8d9c3e99339065. 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/QM6N21735691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b896b55cc6763e95460fd2a35e1200064384fa23f0984be2414dcb6c07cedb3. 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/QM6N21735692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25df4e0b37723afc3917eb4c6a117073889626c4ab062405fd9ba8bfcd0d223c. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QM6N21735693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0691348e50d6914ab698916a8a5b85cb0aca9420dffe90688f0f7e742d2f9886. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM6N21735694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c05486c82119645785c562a93cb506ca132d9dc744cb5abec5353866bf17cfc. 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/QM6N21735695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5db91a96a4c02dba1d51de14ba43ac82eb692627bf0bc916a0677b77becac75. 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/QM6N21735696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afd6357c33bf7d5835389c84e37f9c44050ae1b6189307e83e060bb9a52dd9c. 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/QM6N21735697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a24452807d15f0d94ac9007a78f2be2f7c5e173c0ea02908ea9684400cf4860. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6N21735698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24e4d31a68e7f8c9a35380a217384ff374f09dbf65db3267f9077d711a0572e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QM6N21735699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe880e70a9f2579aaae3e123b3c9ae4b8df9c97bef3764a24382cb4ff910a4901. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6N21735700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7133a2a812ccbe59c8e682eaabda1a6bf5916ac57e9054c166df57c8f43fe594. 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/QM6N21735701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1550dc6e0b20bd9c0176781991703c01755c20e961606ec3d8527e298b99e574. 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/QMFMG1579702.
Guitar Concerto - second movement - solo version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909fb26b3d4c1eeb0c9f6bcbebd9cf57afd0a36853f6f4f7fdc8b7a3424cd271. 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/USA560602344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2623a262a58a81ed9be01041bff9082c29f7812be5687cc1a9e5eb9d5077889. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA560602345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db298e3ea88664d7343f2bc0c0d3a38cde668564b06238d26f93ad7206ab253. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USA560602347.