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 0x7271d1f4eb8195c80d6dadbfadf35c8688f08461696a78bde4dbb23157b686bc. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12b51f9b-225a-4b4f-a4b6-e3a15ca045b3.json and https://artists.proofprofile.net/proofs/artist/12b51f9b-225a-4b4f-a4b6-e3a15ca045b3.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 0xd833f9303fddf5dccaf46a2bf376cdcdf0b1f9da4f92c196bf2070ab816ece5c. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/FRR541200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56043806a3ecbf98983c4a23d45b8431179919a401337b9004516962f0fd546. 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/FRR541200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe802e7956827e0e6032fd31f7f9a2f5184124a668dbbde8d7023506e2f76d072. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/FRR541200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40062dfa83312b381a4139e229cf99815bbf9d1436631ff561ecf124d252faf9. 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/FRR541000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b468c189b402e82f12b16b36fda68fa13f10b694d1a8b931de92c678e69601a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/FRR541000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17299f8214f992838ef61d765e30bbac0bcd19ec5443aec7ef71086f4c439904. 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/FRR541000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0468403d309ee86d271f83881d0771b3a5e067c43468ff73040473d5897ca94. 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/FRR541000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1276f97751b842b58372caaf6496e3aeafcca237c1f44404372cd52c63395986. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FRR541000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4accd0bc04a46d43c0ea2ae550793957169b20dbb36641508d3ab95a70ef21f5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRR541000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9f996d42212ad46a9c5499168166eb5f39058f200245c28fe25b6b767051be. 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/FRR541000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcf0e3afd39671c649339f809afa023902b8e59236b46296f5b210832b4d910. 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/FRR541000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00de5d896aae09b71e7088f5ad7536d3062c6e4994c6954cc3c929ae6799318. 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/FRR541000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c42b4f20df8b82cd96ea15c857d045bb118c97ef64dc0cb3bb35020fc8dc46. 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/FRR541000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2e46a7476e08b3ea9946ed7d4976cb3d80c2226fb56876e8f62e23741bc41b. 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/FRR541000120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0468403d309ee86d271f83881d0771b3a5e067c43468ff73040473d5897ca94. 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/FRR541000050.