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 0xf9de79aaf61027ac7d3946bd8fd87ace9d7bdfea19792cb15e267e35b5ab8eec. 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/7408dc40-60a1-4123-9834-221224faaac0.json and https://artists.proofprofile.net/proofs/artist/7408dc40-60a1-4123-9834-221224faaac0.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 0x76fbf1d6f692b24c0faeeb0dda6f87b76251d4d392d3c38243e6624e1e26aaa3. 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/USSM10203672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589650b253fd196548c87413746655e46322244bf4b0f69ebe8f89ba25f64ed6. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USSM10203673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9e790352cb3f9225a11251df05034aa825c8d9428886d28a1c676cf38c38a6. 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/USSM10203674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6ca9b59b2229c1bf7031bf19693666ef8d7b33b2440ee87a99d997457c42d4. 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/USSM10203675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53c7887b11475ebf5da3ae5ccda03344c7b07624291b3867182427e16def677. 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/USSM10203676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31aecfd60e7c691dcc15577510334a359c15eb49883105c4253d0e3c2b8c668. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USSM10203677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b1495bb63b9c9770700f1b47cd27f7b1dee997ba31ef551dba23892efa5cb7. 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/USSM10200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b433760fbc415122b815241ce673feef18b9c4f8b908e3c59d13475f53ecb7c. 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/USSM10203678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5172044b0f3b83cf2f36ed75e9d4fee63a80d6d132ffbfe2a16059af3a650164. 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/USSM10203679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3629a0abf639d17f0a6aa99a3d303b3a2f987363384951d77ddd520ce8ef59d9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USSM10203680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dd388bb727133dafef2b562a85a79d72da780fccc88901e6671734f6fd5f89. 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/USSM10203681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd721d1dc90fb96da238d966aca8dd1730b6e8a2be62b982286dc91db010e8c6c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USSM10203682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d87ad589d9745e9e41b3ea0206b6bd66b190385b58d15a123d80d33c09b94a. 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/USSM10203683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9179df65db521757567477bd4e338d0be27d3432426e52b8818b6f2b2da15941. 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/USSM16501319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cc6e505526fd207d9876e2a9929ee7c9b80b14039bcdab299ca5b6060ea0e5. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USSM10203684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d730da3f7d9f3a37cc72711b747e8dfb4ccee3450458f45ca70f3b01a5aa01. 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/USSM10203686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea65142e97d0780b88f6af6c81ba1b482e018311f0c5916d435cfdd9fba51d2. Chain 2 (Bitcoin): anchored in block 957240 (2026-07-09T00:47:38Z), 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/USSM10203687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1935306d578905689638cd18d452326957bba95216a6363322d5f5f08ba6a759. 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/USSM10203688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bc03aae66376e37fcdfc21e184cdfc03aafb4469b2ec15f65c40d94fdb3f5a. 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/USSM10203690.