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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 0xda91d1efb783f5b16433ac52a07c78d7a0e51b7250569f32f3cc0a74f8df51f7. 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/bb1cd1a6-028f-4547-8a87-9405c18b275c.json and https://artists.proofprofile.net/proofs/artist/bb1cd1a6-028f-4547-8a87-9405c18b275c.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 0x3d8a4c8bb1b9e5ed4058ee2306064b2466f045fa97b68464697724aa8d0b9709. 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/TCABC1191180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8c0f8d57c53a8959b7ed7ffcf433192c81b9cdbb9c16e12f33534f647cd71a. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCABC1191183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bca5a52a34270389754d6b2a95ccaa4292df541f5f2a014dfb2eccd46d131f. 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/DER370532301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632cf8d253156f3902985ca5e698381e2b9a7db32abf99a7a3e2a00c5f42c3b5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/DER370539902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34b1239e5a0e0da0ae87a68c97a93290195334768b595a615d66b7aa04bc6be. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/DER370649602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c5566392d85906d07f5c5c1e2531669e8142853d9c80a92539d46cfe2069b7. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DER370649612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc983a76aab054466c7af99af6ecec49815e29821f0d88cf2e0c0b4fa5ca684. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ATN261302701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ef67f08d609f0c497b313e62c89d428c97de17fb2852728af496058f24c149. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ATN261706302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62b43b73fb9696ca76faab63f77885fae31d5b4041cee78a4bcb57381035548. 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/ATN261706303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2f0cfc010abe8281758faadc9b832766139d6ae466e619dde1cd6adb27343b. 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/ATN261987302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994baa6b2fdde6a51be487203eb9bec1bb430ac3346cd50c0febcf65db51a990. 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/ATN261987306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0de1a61fbde86861a995da9b99251c30245225c5a8eadd596da2db8a37bd67. 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/ATN261987307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a67b2eb5843638f31d5ef97b31c7452d0db45b0b9657de12b1e8ab031b5514. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ATN261987310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c35c9aff18501d462574f2827c69ea334d3cdaea76556c93db8102b683fa8d8. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DE1AH2386106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3903c97dccfb5f4763f14f9325966d47b7fcb95ce65de36ffe017b41633c9b97. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DE1AH2386102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c35c9aff18501d462574f2827c69ea334d3cdaea76556c93db8102b683fa8d8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DE1AH2386106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa49d11dc43cba18038bfe317bbc8afecdb619cf4dd8f84cec2103f06d9788c4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZWDW2539027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14226f100f887c617c93a840c25466d360e618a83f5459510766293a3d01a5ed. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZWDW2539031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db3eb886e6235f3bae690333e476abfdc2be8b577bd8d08463c2ae8ecc1b0ac. 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/TCAHN2325825.