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 0xe28d53beb4358ac4776c2078e38a6133a649451b1e73ee659aeb370eeca2809a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87529ff7-bcd8-4979-876c-9ba0e789c75b.json and https://artists.proofprofile.net/proofs/artist/87529ff7-bcd8-4979-876c-9ba0e789c75b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa789f156020bb9199a5dede2d515386c15b58bc4ca093e08734e286d737964d2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ES5631105019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a2cb0f7c278a5a4af0bc3258f5d34c6f87f946c7e4ad5a16a560fed020f011. 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/ES5631202454.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450890eba6aef05e6b973da0d07ca342c2e07d73ffec64ae5e5278fa60381bbb. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/ES5631202589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6d72966eb5ec878add5ac0a457e6801f8bf851c3da14ce4ae579386b9fba87. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ES5631202568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b89aebed1f028e5a54af2787121219bd868e4d02afbd093f05c38c91a1ef1d3. 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/ES5631107858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a1cbbc2d1e5eda5a1e38900f4179c0c78adbeab713f6aba66a0254b011f03b. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:40:53Z), 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/ES5631202579.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3f096b51d6225442f03c7acb7578d2edf3d28f1e179817d1098c31d5f1e218. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZ5FN2562747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc1f5d6273a4d25bac1ec6176ea6f79c021106a4dd6e6723d720b0db357fb01. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZ5FN2562755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de09f87b82f36d0c466cbc99b8ade40096d18e27e9f15aabb28b7f6744152b3. 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/QZ5FN2562763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea92acfee4fce9dfe19388db6a9774f9a0ca9228995f44adca2b68ffa96418f. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZ5FN2562777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712242b8a36d819e675bcb6f278faa25c6fe8dcaf7a572461adc56e675ec9b8f. 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/QZ5FN2562784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad4213f68b94c86b81d43cd56ce39c50b454c0afaed7f69b3707332b3a027d3. 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/QZ5FN2562792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4f32ed91389820457a80853641c1ce6bb2d138fbe0e9ee1a9450234faa7042. 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/QZ5FN2562800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093067d4479cad2e48249bb857106edcc6be8ba6d8aab568c28a43ae9024e58e. 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/QZ5FN2562807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc873f9961867c48e523bb3963dac861e7301f4d50f9c7c7be4aa64a75e171283. 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/QZ5FN2562823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a19416d1a5015e639c03c6a9a6e9c229459d42947243a5583acd334ba27646. 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/QZ5FN2562839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe47edb9d2573f879910e6736ea19b59b8b387986017545c9a32aa56f91a120. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZ5FN2562870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae44e3bed1777037181fb804016221635d2affa01fa9301ebedd95e6229d899a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZ5FN2562876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf9e9c6a9bb449422d286e5f5f367f4e8c901c6da6c0c417af0cce05be87c1a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZ5FN2562883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5330e8be8ec3d46b880991ecb5553805ae30b2cc06af4a985080f7ea7b0579d8. 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/QZ5FN2562891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09685a24aaf66f20d266507b5c09375ce37fb8206a90a50f161a3d94913729ee. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:27Z), 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/QZ5FN2562771.
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 0x0ecc3d4c77c3281197e5ffd7ebf5ea488b7b4b1c1e0a965c8aa6a92fe56283f4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZ5FN2562815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0d927d57f565ab80de543782256f44efd68797fb7f339f8be67bc26ffb710c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZ5FN2562831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6df2f2b090823ab35e6df32cadcccc37513bc5ca80fa832ccf30653177ec05. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZ5FN2562854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f811f7a6e41a237b966acd345eca95609b0342b43e47eefabad5d267700736b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZ5FN2562862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c265c74147a9636f765165c0f74a5176ea13b0f495283ac78f5f4192d30713. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/QZ5FN2562847.