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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 0x3a2e587ac9d3794a3d7c6bee296bfda9d27c6b093af41ba3b8e4e407c8fbf00d. 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/03ae2ddd-b516-4154-99c9-2dbbbcdd601f.json and https://artists.proofprofile.net/proofs/artist/03ae2ddd-b516-4154-99c9-2dbbbcdd601f.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 0xc2d057da562b90e7a3c75d5e5215504d83bf42c494a4d4cca2444c6b3fd5306c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TCACO1670502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84413c11d3f611bd944d1d3d499c4994bdd4bbcd87fd99fd03f33b2baffe3eb. 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/TCACS1697926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ff1d259f7d53528b4d9d8630cacee7e0287e376e16a4bd74937459458de89b. 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/USEP41912001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7133e7b6e4afc31614463fd394c13f7fefb346ef24acfa353fd24299bf5d8c52. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USEP41912003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9477a3bf1d38a2bee5a615a8018c1c33dd1483807da78b597f6b95a1f32736. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USEP41912007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ec0da74ecf19763d083f9e50a675cd94638b8f216b3d67ef46f1f086310fb8. 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/USEP41912016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf7fc69ce5939e4ec6b5bb525eea50ebce034c8eb8a4cbecbc9a08239c2e086. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USEP42225002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473d26a5e1e3642d678f734812ed1b5537355be696374cf2a0da926be92fff5e. 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/USEP42225003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5636b601d6e4706410f971b18f97b2265012317928cc663b2f103b37ea615bd9. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USEP42225004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8f484ea9c3d430df09726d4baa020f4708d8254abee002b75ce7dc4fa78525. 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/USEP42225005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430d1af466efb18f410aea39c9b966c4750c13169682092d69c4e3961c45e484. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USEP42225011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16d09539b2a234f0a402a77adb5dcd66a593bdf5dc5f1871642e3727fc7cb58. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USEP42330001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92111a63132b9567f6f4f69b89ca44e37a7098c96b82f09a0a02cc1290da139. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USEP42412002.