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 0x81e78a5e613bf34b001fb2467845edae21baaa1f9755475b1c5e236232fef648. 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/0a14bce7-2d37-4c30-90e8-8009c0009cd7.json and https://artists.proofprofile.net/proofs/artist/0a14bce7-2d37-4c30-90e8-8009c0009cd7.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 0xf542e993903542384de57e3aaeb0d86c572a83651f6d1de6f3a3bac4af9aea7d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWS2288931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2634c1034986b6d3b99eb9b75a302184993d5e05a638b7ea1a8149681e3c5b27. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZNWS2288932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2417e0e34349cf677c1f1981d9dc492d994f2c92add2b05858d0ccab5d9877d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWS2288933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b07530cc4799d9dd041e7f8a9c6e52ad3a12afbb1b10174cb45b4d0485bd0a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMER2298064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd9a66eca0ed53d3ffd3b5f2a50461e1cecae15be5314ff77c3082f92d0e864. 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/QZTAS2270865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd617c571e31cb3c089abb0b64fab138d1f952c23f86a0e1faffa5931e6a67744. 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/QZFZ32335995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa3919aa984e2aac3de63066f1f56be50ba7bef6fe6818bfc2568d5a578e6f8. 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/QZHN32337515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa734cf25a28d04c26ff7a9384aa08a3c09a5524c442850c8fafa7982ca38b480. 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/QZMER2325969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f9acb82f559b971e508d5725a7f268275adf64dca3bcb26258c53597dbe3b3. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZWFE2384003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d03eaeb290bfb54ae150fc24c234d05e8f25ff7e0b89b46ac8aee59288d06c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZHNC2467916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5b68f55eeb47b22f158d578fe2ff75776f9e25cc8d082aa093c266e572ea75. 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/QZWFF2420715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c7173a2b946d7379fb6c2c911670ba3b01f17dd0b560a0b2baea471bcb4a97. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZRP52400464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aece1217f2d5253f8536b02ff8739c850d7165a1a9f431639ca04ef365a59b. 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/QZMEP2401403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8932c7ed777d9e3093818c7b203dbd058b8827f49145e3071eb1ea0faad1f60. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/CHF032503449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd27bd55d3a5b248a3b7dbe7df4c9f1d5a877eab6f3e2521269c6b5fd366a7bb. 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/QZDA62540019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd095c761f2fee57e5c14ca086d84f5ce26285b178228ab117613b1b7f4586cda. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZZ792470207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b1713a3b9466ff16fe92f9245a2aa00c2efb6a90f5ce6ca8aa05615303a5c9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/SE5BU2554914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab77a4247a2e116c9c88a1120fa18b73f0b41070eef63dcae23e6d3bc8df88db. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/SE6XW2512923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38b7574ae1b504e57f407f7f9a2fc2ad0072a483ed61d81df3a50cd55debea8. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/SE6XW2564623.