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 0x459b40ab535108db24a81c7d3a82e9f39ad91c9fcd0393acf29be250fc38739a. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/338665d0-d0ae-497b-9653-23c5575bc3d0.json and https://artists.proofprofile.net/proofs/artist/338665d0-d0ae-497b-9653-23c5575bc3d0.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 0x51475ea09e5f9f6cc489ac7954cd8aa8a528265a3cd9ee3456dfcaacda2917d9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BKCAF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87e93cf077491909b1cb8d741cf6c0dc58f2fc91c68684ae3ce4e13bab9612c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BKCAF2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75481fc535d2588e4c2eba5edb256d4a907ebf1de58f4b6ec05c3bd52b6674c5. 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/BKCAF2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947af5311221b8439a25bbbe6074cf9c066c82c9a9ede0b1e6358d0c97666086. 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/BKCAF2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06628e74ea779138f29affbdb534a1877b891d6d0d631b4057023b84456b3f54. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BKCAF2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97658d20a0e87d35b0ee02e8f3c47c2351c9489e83cb3f95351285b782396a2f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BKCAF2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3752ca45eca3a227306ecfa0004c471ee45d9adb1dfe3bf42edb140a3632fb. 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/BKCAF2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63511ddd547a64d997aaba760af3670f4be11abca3dcda9f2c36670fa0d29b51. 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/BKCAF2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cb2fbcd8b31f39594ac2ca0576546431276616c912c2adfc1eda9a2ad6b29c. 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/BKCAF2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2aa1cb5d7a5601ec5bb9237bb6fe6f1598b30f5727306100f9fb546040cd76. 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/BKCAF2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d44b0f07b3a123920a01b0ce05af629f29b2bcca58ecdef17ce6895a3fbf69. 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/BKCAF2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac3aa0293ad0e226f8112799a1ae2fd196828d3eb5881eed3ff5f4545c3fb9d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BKCAF2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcf7f037cdfa6f4d855621b03ff94e95102c87ed01d852423a1fbab38f8d444. 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/BKCAF2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ad497c2e499201617f9e1351f972bf865dc277e76a4ebe0215ef3635b386b8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BKCAF2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0993687cf9bd21dd43858f94c143e49ec73b282ca90308679077b26188c68a97. 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/BKCAF2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac3aa0293ad0e226f8112799a1ae2fd196828d3eb5881eed3ff5f4545c3fb9d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/BKCAF2200001.