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 0x5c14c5fac1e2f705c71dccd3e30f14a218407a995dffa401b34fac1c0f5a90fa. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a9e1110-2951-44cd-8e89-9f9c60244a9f.json and https://artists.proofprofile.net/proofs/artist/4a9e1110-2951-44cd-8e89-9f9c60244a9f.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 0xf2b741c09b99707878dbd5215a4c2d7a77bcc400db2372b4465d8a0bacb24dbf. 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/USSH50286790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2426989999d02260a317fde681fb952b9cdfc9a1fcf45f72ea067cbe3c1134. 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/USSH50286791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c852c042617ede3bd67d7cb5348ba3c801b48cde60edd1057ee94f85340f7d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USSH50488406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adbf2c1571db6a452378bca0b2fb4d4cdfd506e64345cf4aa0217cc30a05ef6. 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/USSH50488408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1de59b253a00843140938f82022bbc44850ef4a5786cd6b4b455d6b02dede58. 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/USA370566687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9073b24a27b5d45fe6ab435582be92ccbbca3b8a1ffda1fdc48b08f808d0980a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USA370566691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697260311281f08dce61b1390bb9833867975d4d18e1f343c9d34ca8d8e1ed8e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USSH50488404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94057200c2ff56e95632402ada8ac7a0bdf127c273bd1a8f450dc5fec61aceb. 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/USSH50286797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368ed7adbbe7b21a4a112b2e34827d27b4c6e5033e925b6c5b2a2e3776112c81. 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/USSH50488405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9590e7b4098da158864457216fd6af6c0085879c94f64f60f3042b0c7505bb. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USSH59983709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350476e1eced0d1d78c1809c989054960f93f3e677f127b6f04209d70a634272. 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/USPR90600801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd135c704e830af3de10581fe01916a09c281cc6a9e8100da2b4d371fa53fa24c. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USPR90600820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6865085968f544b735cb44a6a84f03f778181e18f522018a05053c2198cb5fc. 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/USSH50286802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adbf2c1571db6a452378bca0b2fb4d4cdfd506e64345cf4aa0217cc30a05ef6. 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/USSH50488408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94057200c2ff56e95632402ada8ac7a0bdf127c273bd1a8f450dc5fec61aceb. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USSH50286797.