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 0xbd64f3c567b6b97ac84f8903be845ac956a3a5740c9287314e45c90d2872fd2f. 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/9d94dc39-50e6-43c8-86ef-99433d8e5717.json and https://artists.proofprofile.net/proofs/artist/9d94dc39-50e6-43c8-86ef-99433d8e5717.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 0x7c6db53d36fd1944bdffeab2c5eba47c94ecf9f146697215ee3194fbf32cc4be. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM4TW2327010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf03705f5727bf287fcffb9ac3635385519ce2379c6e3a6725de21d7ea61d785. 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/QM4TW2357655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5877eae2d87084978bdb86e2548f621853b5a6d9c3d186c8bfd57f04424fc6. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T07:57:49Z), 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/QM4TX2302664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497bffde1cc62e03578848e2b3e49a1894b7799a757bbde8a73e4b0edc337a1f. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QM4TX2337127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce949d8222b574ae8bd989fb4b36fcbde510785a9f0012cb4ffd370d20bd69b7. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T06:36:44Z), 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/QM4TX2374698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a9a193738ea10e2cb135dd70d63fdcf6d7cfb10a8a76fea8013da1bf03452b. 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/QM4TX2399500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9be3dd28b5e4d94fdfb43672f70377941cf2efb19939e15dd6d0e3387ea2dfc. 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/NL4WT2300285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff073df4cbf2b118eb435520fbbe6189240266cb369253f3f48b636e1869c4e. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/NL4WT2300296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eff5f876e0be468e54d733b95ee106893ed8855c616c1b96f804f4d78c99eab. 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/NL4WT2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7799452f741848ef55592ff8d139e2db981fe2ad0aa111544e7e0604e3948942. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NL4WT2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21765b50b6de52a404737a516df174a1148299e6cffe70d159ec379a01857679. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QM6P42569768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ce811ca3b8e4cf94fc5e918936821957a465e6c3e33dbf51638441c28cfddd. 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/NLG6Y2300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6ad698863351f834f9e6777efb475c26c83b86c917223471ab0428c77913a3. 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/NLG6Y2300056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd907306ca5f9fb7711c120c06088e55b8f69b40975b8f7a6d3d35f1e9ca690b. 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/NLG6Y2300055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8804e5e2521897479394cf8edce066aac0dcdbd904f028e4cac418e27fb53d. 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/NLG6Y2300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3140a6b82b25b841e7d59d1ae7ae028314b535323fd15927ef6193d25e264e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLG6Y2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cc41cad8dbe46d12b403f07d270777b234d0c33cbb7bcf93aa7b1fa14aa7ce. 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/NLG6Y2300057.
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