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 0x70c1e44bf0641de54619029439125f32bcec8d5243fc25a758e5897529255a50. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b5023bc-0fd7-46f6-9baa-2351997893fd.json and https://artists.proofprofile.net/proofs/artist/4b5023bc-0fd7-46f6-9baa-2351997893fd.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 0xd28ff4d3dac4246cee435b01a366c547e231c8b055a8f37886b0d2778a17ec9e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACS1603093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c855996aa136310178e8d86bac21c584d489ccb98223871dfc4c3e261514a5. 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/TCACS1603096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64daf630d622a2bb55a4123f96d6cff38432e9637b65d3fca6a5b6c92c08b824. 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/TCACS1603098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7654759b40c0a138fbdb80446da32e9cd2ee62556f47d44a646b567d3ae5a25. 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/TCACS1603099.
The Hollow in Retrospect (feat. Liza Anne)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3962a72d768042eba5940651b8ca2afb6492b6fd0354018efb508545808c5357. 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/TCACS1603101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0c68084d8721639639807a572c91dc8870dcdf2812e70036c9121cf85cc25a. 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/QZK6Q2476911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403b706d4f97a23a7e9db2ac30be8f5019bdbc18737da86e65f8f9a8f1a85928. 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/QZFZ42478054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb541f0b66a08369bb2b82bfafa434f919ad8cb2173afd4c402f153a4a63fdc0. 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/TCAHI2361893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92209b197b6296b1ecb36fcd38bab7d234b3d1906ac6a0e92c7a1719a38d1414. 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/TCACX1733910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2581dd8ece1eeeb91bb688e675f8e7484da928c6dac91eb3a3774be94c602cb9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCACE1582964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3994d06348d483388d04e43952c109e28cb6b4ed1d19d7362395b8898c2548. 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/TCACE1582967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e3580b3ddc09d2d1eebf581d6a3f717e8981bd5aeb956cdc6cadbc639d3a98. 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/TCACE1582970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f04dfaacda5938677d0cd6c77e9f041f2dafb8bff837faf4c0870ce5af0cc2. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCACE1582971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3667cc823dd26173a03f130aea7659d70e9654dee44d1e815b19213b73e8f01b. 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/TCACA1488266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff43a97823b0af107eb42186ba192ee41e508c6b09623a3373823b14b79f493d. 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/TCABY1457168.