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 0x02724b6e8159d7155969c2c4df471a7953a868b7954b4795fb4f6160e003955a. 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/bbb35813-2875-42d7-9318-8982c9761723.json and https://artists.proofprofile.net/proofs/artist/bbb35813-2875-42d7-9318-8982c9761723.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 0x13b74176365b2c69a582b57918fa96dbd45307338e45d414a79169fa556c4932. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CH7812410595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b5c93d889e09232b998a53fe8786a56a47067d2e8d5c4cf2a71c2a904b24ee. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USLD91757783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd6fd43b678f7c6b6b6ef263c252426eefae51d0ba69d3c372e5abadca8067c. 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/QZAKB2384404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035ba51bd9ba432e192599cf8808a38c9c4a3df4151e89f53de1383a4426f184. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CH7812407389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c04a636358fffed4103e8e48e306912b0a0e8149a9bb268103f8ca7f101549. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812403548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138e55c8d0abb7eb4e881adfce7a214bc8d455b94163e7252eb567c2ded9c2e5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CH7812403549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55c46cc98d7679f444128981c2730e8d3ab9c4ea24804ece9d1c0dc75f0707f. 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/CH7812403550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab42b71c35431dd27bf241f929965a783a5dc4e186e0f8a7776c1f59ced4396. 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/CH7812403551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de382192856cc552ea67afbedd41fe166e456157e97400fd1c5b387414ee72a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CH7812403552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade57673dfc5c75106621bdb63e8aadb07951b4abc727cf22c3480208342e404. 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/CH7812403553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc836664658816a37c9cd7bd8145ff1a07ff636264bee8568b7d5059d5cb8ef32. 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/CH7812403042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b1808084caa1182ffd228565618ccd23848138452c9ba70a55849a791f7f5d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CH7812373187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5112846f43666cfc6ebc7b31d895cc5c49736c234268c47fa1dac90620757ec. 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/CH7812371791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b262505dbb0bd4c4354fae72d3ef84c5d13ee6909ce828cb9e015a59d89446b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CH7812371789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7cf32eab108e27166fbde566bb35d6a29b605f9a0201b75dfc4e136051954f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH7812371788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5112846f43666cfc6ebc7b31d895cc5c49736c234268c47fa1dac90620757ec. 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/CH7812371791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60cbd72e5a06b36b71de8be3a171dc7f7536b05718a8eec6da3764394d774caf. 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/CH7812369912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedd908514579ed53c0dde895e6a2c19b2522291e50d4c9dd1eaae601f5c251e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CH7812364949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106a86eaba6649e6943e3884965f23ff177791f11720f81b90c3b8bc32c9fbe6. 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/CH7812364950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf27c29bcc7e1396ec5494e605c95b1890ff7836ef7ac35854a163a6ff5edd6. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/CH7812359483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e921ad3c442dda3b59437f574a6e63d1d35187c96f689902c5507c883e0c7. 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/QZDA82216378.