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 0x001479ac0a1483c949c057d6d8a68566481eec22ff4df0cfa865c23aa82516ff. 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/448db0e0-5aab-4d77-91e9-14fc2721ba63.json and https://artists.proofprofile.net/proofs/artist/448db0e0-5aab-4d77-91e9-14fc2721ba63.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 0xebdceb01682d123f8e008d80003ab121969da88d648d5e82e5c07f1c5e297293. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:06:32Z), 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/INS920800322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a8885a26c11ef3530c609ab265598f07c693723a196532f011733f4d5817e5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/INS920800323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea144ae4acddb012f48026aa059143257108d9ca8b15ae4d31fb4cf6e8ea6991. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/INS920800326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e833fae628becdc84fc65cf8a91337e2a345132435e1456c9e9642a56ff138. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/INS920800327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d84e71c0c2d38c9f1d7f5e10d4297dbfd635cfa039d946f5e4cf53fd19ba49. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/INS920800328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48855a3a4f8c511978deb46a68f5a4afa71adf7dbc4117885258c20eb4eae49d. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/INS920900706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250889afb8802697161f0daed7751acc3f1c9c2253eb7b22ffb5bc5ebf8b03b9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INS920900707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0f22b0b3fafe1d69d9481ee2e86164b6021ff2acc7bc0d40bf974c7d5ce38b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/INS920900708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237af4a52cc1f9e1541b5ce085d3a3ee3f66930703bef7f94c3a74d972e982a5. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/INS920900709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedfc4fdf85f0c1f16edd9cf950fe5b01c9c2822164b55d545c7c40fc1601a0c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/INS920900710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdfde84147cd2bb014b2a02e7e7c79a837632beb75fbabe6d0a44a3f74816fa. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/INS920900711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f14150de3dc75b5750fd2cfe785f03cb5f1b457bc93a3fe85a97436a3626380. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:36:51Z), 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/INS920900712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b057cf1eeafbf7db5ab9e5dc3a5a0b0bbef592127cc31a3365284baa60a87f. 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/INS920900713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e63e402a5fe0661afa806f97a863f0c4b2c718b66b0d2cdad3c65e3978a027. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/INS920900664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ade1f4f31cb43261311815067edb33d0160d63e27fc74d0796c41d6a5770eaf. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/INS920900666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c92135956599cbe2a27aa33b91f165e144c0eb26f11b61b951090d04cf3b111. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:15:46Z), 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/INS920900667.