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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ee85905f3201e1463b11c213bb7da3c60d24eee8fe4c750db204e19ce73de6. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e77d1f07-78f3-4062-978e-7e74e34a1964.json and https://artists.proofprofile.net/proofs/artist/e77d1f07-78f3-4062-978e-7e74e34a1964.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5329260dfe3b920aff00728af332f427cc21d608df953b4b853be1ca9362c59e. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/NLCK42212217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8f9cbfbdfe9b5c837c386c515f11f393f9bf6854d37e59aa6be56ec37a7c25. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QMSL32200194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43077ae5846b2a1ed7c528e1f3a5f8a1f703d74ff86d91a13753158880a8a00f. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/NLCK42235503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc541d8ad0ceff02f7e52f0a938fefebad1a138321eeaae2801ce81371a0199f6. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-22T01:22:15Z), 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/NLCK42235505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa031da6ac041028524eb55885135d5a79f7a94c2b712544061a747dbab4d7bd0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:26:28Z), 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/NLCK42416309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72bf48dc0bf1b8e5ed46be7d303dc6d88514ff73494954ce7836f4262304f97. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLCK42417711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7d573cf5eb9fd2683db40fed04a4100f5631c3171ee68945840a2a5214bccc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLCK42417712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe739bd4fbd733d5eb322fc324f6d4be1e8222af6227f768bf49690abe8a1ef25. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/NLCK42417714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72bf48dc0bf1b8e5ed46be7d303dc6d88514ff73494954ce7836f4262304f97. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/NLCK42417711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7d573cf5eb9fd2683db40fed04a4100f5631c3171ee68945840a2a5214bccc. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NLCK42417712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f039ad1172ab159faf147e8cf678c1e16cf5a3f919ed49b4d8062791443427f. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/NLTH62500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94095db4e84dae8d7185c3ade3c515b63fd23092da275cdfa9ead7afc520d1e7. 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/NLTH62500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03853f2bc6b17634769dcf6b89dcc5f1fac295c56bf108415de78d81a780556e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLTH62500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3db0787e9df22749030bf7f366966f5bd4dc0ca435073b55eca6296b1f6c1c5. 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/DEG932403552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d30d5ff98aeedd2e6ed847c65492ea8decfe96c42a111720836d521571ddcc. 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/DEG932400611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf58cd7b515eecfa3d13f12532210a9bc62d89f895c4d7927b13a6d3998b31c. 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/NLCK42504633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d6c22c8d4290ed47b93e3e21dc4f2f79e9395f311fdde0bd1c150c6ca54e15. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLCK42223255.
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