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 0x33be0e3a96f5ad8af187f0b959e75fff712cc9dc8a977d985e4a38b548e13716. 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/4cc5d269-0e30-4cc6-a068-088116da7abd.json and https://artists.proofprofile.net/proofs/artist/4cc5d269-0e30-4cc6-a068-088116da7abd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xac1bae3e098ad26e043d29b6ac70cc1f8d4765dcb249bf7cbe89d48bb096a1d5. 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/AUBEC2479065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067ed0967c4bffc4bc73b5d393d91086a342785bb100552a031876ac2f508d2c. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/AUBEC2480112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c84cf1e17843cb44c43833f2e39e45cd9f46801c8e2972e1cabbae633abbace. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/AEA0Q2432779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05362125bf795f49b29f2a4547da7e750412b4fbe6d697d400ce50f2f1745ae. 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/AEA0Q2432780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86149993d72f0fb432d7359af14bc88a980ed9758f22beaddf3b46154f6eea27. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/AEA0Q2432781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fcc15f4c0e3b5d6d32a41cfb87930f22c8eb739d4bef5091b7c4fdb6d7417b. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/CBEYJ2480140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b23443a6e447c2dc35a632c469c24939cab7581c8fbafb7a02ba47e7f48d30. 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/CBEYJ2479957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2072c8af32a7d61c6d1c92a93f18c7c61d1d5e1cffd9b07c40210b6268dfc2ea. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CBEYJ2483380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187ed1f6d1f70c7e0a8711a2daa0f838a89c2d0dc0147b8d47ce83e3b2c1cc84. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/AEA2W2516457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b1e8810f596fc5dbc2c54e29c929c59d54ea26f2aa6be62b45ea344393db2b. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/CAHQJ2531006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43be029e9dc4bb48d4650a6b983bc5229bd901c486660621e1cbaee1f072b02. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CAHQJ2580345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37b243431313ceb13edf0ffc7b20cf710cc5afc058c07e5018b449ef063964b. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/CAHQJ2580663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebaa86ef66c8a970fcb26f67fcd58f0adb194be00b0c10fa6e039a89802ea072. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAHQJ2580662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e90d61833903661d7e47776b5d5a6a90f71a4124cdb7a90e2b292a7fd3ae1d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CAHQJ2580169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2265d6c7420bde33312c7d4746cacfc4c02b25b4cebf725e6fe150819069993. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/CAHQJ2583541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546879b39bbed720f21575dd4995300e722886e1289919178a15fa53a200ca24. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/CAHQJ2588293.