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 0x6e0d86db36c4101825364824eafe7b27cfba6f911d9b6444fcca4c889f520abf. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2190b277-c38f-4ea2-aa90-d6232d16d1e3.json and https://artists.proofprofile.net/proofs/artist/2190b277-c38f-4ea2-aa90-d6232d16d1e3.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 0x68700270d1845dff9cab6055dcddacfea6c9a64080ed712272f0f4b217127460. 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/DGA0L2417337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecc1064209a5204211f6e91002f67d3dbe36baf8f84413ad3dfbc3583bd8569. 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/HKE022234524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b08644bd3cfe1791591dd97731e222bb3bc00d693cf3c50ee9b3c069191b037. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKE022234515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108fac9ba37acbce03ef0eff31e202e6d3f77820e63fed302ac00af29582a9b2. 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/TWD252301021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa08d3b6c139a35445f81f69acacd36877eaf18150a6d756fe3dddffb77157c. 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/TWD252300730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25646208d9b881ae8e9d2b8a19b76abd268684705a164b746ed5807978a2c0d8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TWD252300743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572cdcee099993d63fb2494260f2b63559c0064517b65e652861fced55028c9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKE022304441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5eb1e6b17f4f3462f2cc407e0067f8e17bb5a8039e0e6aa1a09bee31e75ac0a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKE022303785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f017264a447b34deb7d80c407d73ee9b2c143d797221b466185009e82f68d09. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKE022303786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4348017c835df147429974f242fc891e948916c38f8373b57654bc6633fc4fdc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKE022303787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf6b532b33fce21824bbb1d79e5b0b990ff9b381d184247880921ba441fdd10. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKE022303734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d0a4c24ef1dc9d0689c058653770eead7ff0b87b98374c6539c377378a0d88. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKE022303736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe249d34dabdfcc110102ff41a45d8317d7191c8ff0f778a986c5ae56852c5c43. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR2X42540632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c91d1cf89999761d957801501ab01d17c21450f97e6843b481fbffd365b6cd. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DGA0S2415170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c76a2e6ad8cfe09fd57f93e1feb26a0227baea55cf60f9d22f3e9f9f9f930c0. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DGA0S2415171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377a599fcebca203fd818dde850c644506539328cb1285b26d3d52b1c22df803. 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/DGA0Q2407833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d58ecbd346f37b808b9568adda20381ea4f5a32aa779b74334550a8a6d2659e. 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/DGA0Q2409594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f330e0c4c186f272a8f3d7e6f4fcf7a70e0dccf43941165a00c6639d4f144f. 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/DGA0Q2409525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1c121293632e0fda682fbe6a30dc101d061c389c54c6f742cc29b878d89ef3. 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/DGA0T2407530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe701467e94fc60c51013d0142596517a2650f1f62cf059c07c440757465e264. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKC992325979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8ad1e715758d2863b5b3327a2e2f175ed6496888522458bfe7d4b4c5e9e9d9. 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/FR10S2573432.