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 0xada79b6d453d630d97bf3285bc264962fdf6a0ad3ed59740d30a01f64984f0aa. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27142e87-96cd-4e35-b715-24b9a95b190c.json and https://artists.proofprofile.net/proofs/artist/27142e87-96cd-4e35-b715-24b9a95b190c.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 0xcc2e33ccbf71d2a708e344d310a599094eef5ce8e5d62f6bcabe3406bde1186c. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/SE5Q51825335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd86be4e9071969ff7d53cad9deb14feb410cc3933cb470b1540896ec8a1f50. 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/SE5Q51811350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948f7e9654cb612e1b587d99ac697a58a14de6acd42f4f70f5b0c11f18fc42c6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5Q51826783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42253fab02d772efcb1579840e15d7b4b11fcda3a9d3a0a7782c08ea13fd0ab0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5Q51805171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae649be2a970b5c660108ba8180971716fd8a706a386f5fdaeb015d17cf3fa8b. 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/SE5Q51801981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf07bf5165644a6d42efe7e620cad94bb3189c98772718c82a1a07ed58c0dcbf. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SE5Q51818501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e18cbad6b3768a1db2f6ef71b19a6786109885f23bc175cf2bc7b7b22c1be81. 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/SE5Q51809270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665cc7474982fa14ef42906c9a6d356b5d91cba9a0d4af52defb254e6fcefbbc. 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/SE5Q51812149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd664337c803653c65d1416a310af5d4238a56c5dfa6fb9fa7062c70dd96fad0d. 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/SE5Q51818327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b02a9b07407ff98c99df657d2e2df74a349fd1a76539ecfb86725b100eaa7ec. 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/DEP890710197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5959a96eb5a2046a487f32e846e06c1d9f0abd4db69c41811ec0cc531a1ae7. 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/DEP890710200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f490e9703a639cd29603fc9831348d8f87863dbc4350fc99c40aef9333ca81d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEP890710205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d89636011d13481887498854837b6ff3f06f4e163642eb2457623279ae8d3ed. 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/DEP890710208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b557f077b4ee8907042afe5d99a04baf3d53a10187921b4e8424bd59c46ef8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEP890714579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1237f70917732c780e209daa056c5c3fc3120c5bb1a26b5640e9b9946e65e5fa. 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/DEP890714566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af2cec2f83a2b8132567d23647994db0e8496b6e2682b2624f707c4b3be6476. 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/DEP890714572.