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 0x47a8c4f3853b2fbed242475e857fd5e97fe2fce08718bb777c47067f18a03034. 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/a68463bf-a347-41c3-bcba-864f0abc8b80.json and https://artists.proofprofile.net/proofs/artist/a68463bf-a347-41c3-bcba-864f0abc8b80.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 0x737a61b0c5444b0ead444b2638ae830ed3dd3cc00dfea7d5ed4973d4b9924b78. 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/ES25F2301085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba784fbb3c79073245dc7660c1c0d160c8047319004b291a8a1204295b3b6247. 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/ES25F2301086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45696c6dd64a91c68957f6970a3290e849854141e104546ac2b489d7c5fdcce3. 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/ES25F2301087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8be80a811845f4107af4467aa8d78acb6db1abede58e1c5db7e9fe39ea137f. 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/ES25F2301088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff2d9702ee67b08d879562aa91a652af7ad1167e5a562f8663d133db5e7ada8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES25F2301089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab686fee7a5216d53fc3e83940f20ed951a2b7d0e40663e39b755fc576c84e69. 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/ES25F2301090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66a8a6c95a892bf13a539ef279a9eb565f50166a50174ce200fca475b63db48. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/ES25F2301091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee112d18287e110beb951ea880620850b597ee36b255cb1e9eaca8bae87a5c1. 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/ES25F2301092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634237bed772d191630fb8fb38d0caef16f9836c702d866270b7571bf6060f8e. 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/BC3PG2500382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee70d8f8249203bfb44c6a421c826303144cca3bdf1d7256f10da857ad251717. 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/BKDFK2400393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54190a3176471be12a6ae912417e95f51fe7495a9c003b6d3f2aca8c571b737. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXKG22403098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfc581ed3b405cea3a41277cd4cff6eb07ad40571cfb7ba4471f37ab3c35a41. 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/BXKG22402348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2587bf9efc3d1965a01c3584c2589bd080923113399c7b0aa8042b3195dd51fa. 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/ESA112317209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681d88f3f53e7eb2524bf96c501fb55f2c7e7a7da908503490dabd87e5ef8780. 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/QZNJY2387847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62897dc7da9e408284bc6302ae8a6d7901084386083b410d55c8cefbd8821a53. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BX4IU2340556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745a33e5b68d3e8a98ead861cfd9b279a381dd61ced1b2c92876daea391a3bd0. 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/BXKG22302069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59714029560de90805ec0ef3b34d7ed47a8b6174fbbf79ab054701d85e0c0f78. 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/BXKG22301664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45552622eeb32e7c4d01a6dfe794c4b6d67a1c15c7d0f2349d4e283ee4cec82f. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/BRUM72301532.