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 0x5c2ab251c34198b2b8330e3e123c5abe8bf2f937485b47ae2fed41b7596aa3bc. Chain 2 (Bitcoin): anchored in block 954004 (2026-06-16T21:01:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32d446f1-8948-4539-af94-2f7b00828bae.json and https://artists.proofprofile.net/proofs/artist/32d446f1-8948-4539-af94-2f7b00828bae.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 0x4931be756f947211d5a3826df322535eab9176949e75c249d13f84b1b3b03ab1. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FIKJL1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94ddcab74ed06e9fc45e3ea2c0069c48bfb25a1e212a55fa06a2cee5e30ffee. 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/FIKJL0700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd13427dffba57c4ce67f38518541c8802b838aaa302f342269563c6c1fadc73. 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/FIKJL0700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c6b16af9cf2064b81c8aaae49c034ce52343d90d71add7fc357deb375abfde. 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/FIKJL0700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e14a5d371b89144287ab8073cc9c3e897d3ca1cbd5558043f52356ba81c07d. 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/FIKJL0400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60067ab0013df18a1c1a103d711051b5264dba54fc365b660bc89ef5f8557b19. 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/FIKJL0300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f31c7b9a63f0952c5cbc1c94719d6899fc1d75be583c0a8240476af4d551e6a. 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/FIKJL0300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7bfce3e60b81f3f50edd990dfa349ce4617adba15203e74130b28718b55a31. 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/FIKJL0300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfe23a0c1115c77f0b6661d93d9348947f74e1b15b8568d54550a25a2684eec. 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/FIKJL0300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede3fa5e15f963639aa6e919378a9bd10e7f83c525cbfd620116864d2eda5b3c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FIKJL0100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a1b9d36ffdb4f449476277afec5ffda38ad69f2c825b63707b3a330b7405a5. 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/FIKJL0000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7c65ee6ed5208f67548d79b486e7aa2afbf4fd7a1dd2dd04c78530ff363064. 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/FIKJL0000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ce2894fd53f7c10d6c8cc7d42e6786acc611edbab9d5db56e906884aeced6b. 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/FIKJL0000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67be93e006da2e468201b34b4f0b2f76bd86d7427a1e590524fd8d291879dec. 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/FIKJL2400014.