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 0xdc02936a2bdeab0c173f2b13cc848bbbf6e57b113502cef4b2930bc630760630. 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/e882a9e0-0a84-4aa8-b954-bc6e28a2d092.json and https://artists.proofprofile.net/proofs/artist/e882a9e0-0a84-4aa8-b954-bc6e28a2d092.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 0x7c3805ae44091794d0dd4894a56ca80eff45a682b91dcb62a3d757615e372335. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES72326129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863e45a2900cddac6bff00c749b19caf52fedac1dae66d229a2a15332b629669. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZHNA2333772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234f9e487ac646ed7cc0890b13ef6f486a25f576ef7c68fb719cff440b3587d3. 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/QZHNA2333774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efaae44c54b9d9fc57db2164b9eae86b5ad81c5befd655f682ebedf540be27b. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZNWZ2355029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3decc309c3ba458f99f801823b65ec878d43cf84e3ec26e1c160ce1cec63a9af. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/CAENV2354028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c95e78de19c42d20a70dcec4c75f3d0ea24651a5c55e87e6ab20c450be91a9. 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/QZNWS2467278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e01a37afa6411838a6621b73bb1a8af587bf35ee4274fadf9859fbbbfee5c4. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZNWT2486530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9adaac4bd39186c94a1411f4e47e4b29d52f4de201ce56f656acd5bb300114a. 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/QZNWT2486531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b0a4d513aaea0ad4c08459d67ce6262e1b660110aca4d005de117f2b08fc42. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZRP52458777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79253b2bfe3d1e497f1f509f0778b7a0fe8df636e01dfe934ea213488dae0e4e. 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/QZRP52458778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe620f938fd8e3f39156ddac255fe7e54bd3762ce15855481753be92b530ffb2e. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFS2499031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047ff296762fc16db94579b7f13e3a0d8db9997e0416ce4b49c2dc2843acfe19. 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/QZWFT2400325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf41c6f17b18b4c1643b22cd8cb2d69df71a2997e9466818a058575a84f4802. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZWFT2401676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b114b059b582bd3e70bc7213c728c509b65f9a66073645ff190fac4e90af719. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZFYZ2532358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b57ffbe7e45128bcda4281afe308aeb16295229c9f9a7e631b3a09da56beda. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZFYZ2535212.