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 0x0be179ee4d1759d85fb00dbe165022714aad03e5a51e998fa7a5ea18ae539d0d. 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/3d7bd029-f605-4f85-8f2d-efe94003a0ca.json and https://artists.proofprofile.net/proofs/artist/3d7bd029-f605-4f85-8f2d-efe94003a0ca.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 0x0c53ab039321b20b225046cf1ba62582cba321546a115bc85dd0570912c33794. 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/DKUM72300332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b77f4b191e4f5a5b03c57f0426e15b8e5cfcf7801b8de524fa8dc1f0bb43a29. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DKUM72300342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f7a7671b2d578c185a7b30da31bfcf728e14c1c894d5400468b5b321587fcd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/DK2DY2300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc711bc7829b0c97a0923dcc03f81403593db7da16159d0a3cff78d1ca9161438. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKUM72300333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf9826a9fbc7a07e2b5b4dda901de40065637395d26446aeb955285dcc8644c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DK2DY2300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98366dd679dda902dede4699dfcb74fbdc8391e1b644765bac5c3b9a4fae9f2. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/DK2DY2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1a44c4087419e7db1180f4c8308aaa950f1427e901d76b4fb26a28e14d1cff. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/DKUM72300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebf09e18337122f259e7cacbc28e2725ceb2f33536b13a0de0cfbbbc588bde8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DKUM72300345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9e8c09254944286e391143039d23ab8faa6195028f20653baf7e865534adaf. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/DK2DY2300098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd9a12bf3950931671dbb286f343b167572509032defea0e20c350dfb9fcddb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DK2DY2300097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd44eb3647f2ee5736973a3f81a3dc9118059efb38acb7550e6fa24c3287038. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DK2DY2300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec5b16c326d6c9a10e549d4342ada235bc2e9346e89c7627839f6ee4efdd94e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKUM72300347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426d463a276561d9e0eccf19ba4e6620a28bce7156537cc88aa4b6e529cf1d70. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DK2DY2300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd82a5cd293e828def9269680fdb6be3c2b29b4300872cc6d8497707c5dc867. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DK2DY2300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f5f5b9a4302fe3a9c2bad71f514d75d0d58b0ac1ade1edb0a2e9e3f6b1260a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DKUM72300349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe7be76013b2a4fb024ac862c16f16329c0979ecafcb309f3de2b21a8a391a7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKUM72300350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dd167bc2d38c35c106bd869cabad9c514cbd38a60cec17a187586372548f44. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DKUM72500341.