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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e530a595abd80a08f0e0cf4a85752e333be8437ee084153802605c89953f2b9. 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/820e5224-25e4-447a-8625-523b92c31f35.json and https://artists.proofprofile.net/proofs/artist/820e5224-25e4-447a-8625-523b92c31f35.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2554382c7d1241d84d53d4fac6ae24919d0acbad0e2f33b12d0f0b3a1e208cca. 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/QZHN92147748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bee07eea60209c90cf853bd8bde8e798a0e80d3a32c5bb96d3cfbb8f33330d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZHN92147749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2749f613752097e69820b4ecc0a59f30cb8dfdbeb27d854ffc47edf82df6597. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZHN92147750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffb1c6040dc0f9058457b85a884cbfc1f89fea26edd73d77a7f86b24d9d41ee. 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/QZHN92147751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a19ccabb0cc29b7db1a99fd7cbef1e941a236e66c663bcc48de83d8978d08fe. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN92147746.
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 0x61c01adf8fa6cf1a3ae8feabd75d8116e381235addcfb38f9deb7fbe2e12da4a. 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/QZHN92147747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729be21b00d2d9d1ed561a8bc6b7f42775c0b6640935c4f3b44cee92fd11800b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZNWW2486590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bedb7a8a72b4b5e432cda6f05b146b74e26643ed8eaef9f4a1d1d0efabf143. 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/QZMEQ2432335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4113c7a28009e0a1aac5262fe23f4d67293c2590b81d6ea3a644b922e219c2. 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/QZK6P2411617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515c1c15dd1c9279991c2fba1ee0a41389b72f3513515f0420a2e06daf51f724. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN62472983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf7f81f5de3973244a374e55f27b0e44dfcfa62596a2c4bee5a18d1ee6d3708. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZHNA2319499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8946ad9073ce565bd4e606d3fc7b70b742eb4e10cb2d5ff0ab880f90fd43d1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTAZ2242691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9731c0d267cd3d9965b82dbecf7811d201afc08b85ad806094261a11976d559. 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/QZNWT2213217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32f48aded96a8fd37f759d89c64a10b4fc22e55ede65bf59a2de363a22f30d2. 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/QZMEP2269894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e5a862bf610cdf19e3b84a75bf46473f80b0806cc431a86a58b6c4e9e4e6f5. 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/QZK6H2254797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f3199af7fe99ebd8a348d77ac7099325961334d15af86cd0b8b5dfcbb97051. 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/QZK6N2229751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa110ad6aa0eef6d19f4a1be9767d80176c78c9bfd647135f088d0dcc543c4b1f. 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/QZHN42249342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aa20386be68d8eb696fc976a07129a7203ae2125104972cd68b2e3ada84b55. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZFZ32296766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb842a0d98d0ac215a188a1b6e7de6576d63916e22ad07e827bdc687758a26ce. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZRP52167693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795755f7c1f7c3240e8974a773e99aa54c5e5e6b4ca50c6a2261d3bae54fc2ab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWX2150178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2a93975ff2be9f22a4a113ae7fb9027e3a7c8c542086187fc6a4a45f294630. 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/QZNWV2120891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39468fcb3a8b3af0f2bd3d921762f22afa8618dac90054df772dd9932460d70c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6G2165530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14e2c55bbdecd4341a4f5312025b0943ed94ac7d623984732a403ded2821484. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6M2189677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b54d85d423389a8a5f64306daea32978e05dc29445706f60d7481c709cdc17. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6M2131475.