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 0x348b2de33409713250c2659360c84598d7c132f59415caf3368a202d055e967a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edb581d9-1273-4543-ad13-9296cd17a105.json and https://artists.proofprofile.net/proofs/artist/edb581d9-1273-4543-ad13-9296cd17a105.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 0xaf186c6bfd05ae0cf995b51c95d71f30d10e55d2d47ef154e3e25f60094a3777. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USHM81995871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a185d48041aa8b00544b2a621d4f392adf4990d095ec636be76e897cd9fd1e8. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/USHM81995872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b6217df35b60a3ed582849763b0e06fa2d14031bac16605505578fd5c87f04. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USHM81995874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f7d19bf8573ccbaee731a21136063a4e0585591d36d6fb4e785cbe8956bb21. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USL4Q1968523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0401cdaf2a8b793abe3af278c7b7512cf1108d05192fda1b92cb2555ea7695c9. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USCGJ2191911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbd46d87d2e754895bee7767a4116f86ecd7d4b15fb1f361496c27a15736e48. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USCGJ2191916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ddf41fc0d89e9c1d6cd5d64aece206c75fcfad22940118f7d82093a6e2feb83. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGJ2191918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0dd2bfae7db067e717bcf99d266a76b15ec891854a276e933af3d4bd0c96ee. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USCGH2266683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67981129aab8d09eb787ba6d5b3db0d6ffc256d91dcd2bdfba65d3760cff1ca5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USCGH2266682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb017e9dd7aa80b88dcf9225a9f42d5f07e01771e29f2b7b39c1cac755b7e4140. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USL4R2241489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa398815783373a349ffbda40127660ea2ce999df49c6583aba293fa81760d3e5. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USMH92301257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d6704771f3a27fa06d9b57352e8217c948475aeba4e01a937df4ac09bbfe10. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USHM92458477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b909986dcfe3db49cf1ffa67ffbf55071ef40e9ec16ca3aed452d4570c0d6d4. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/USDY42532105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cacc3207a253b097248092d498f66b026c7cbb8046b0e858e4dc6424a2eb43. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USDY42532108.