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 0xcc0a697e4b3fabea0eea321c7d7b1a732cd300d032b5e8e4d87ff2fc16cdb41e. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d3fad56-6467-4ad7-bea1-67aa2b618e0c.json and https://artists.proofprofile.net/proofs/artist/3d3fad56-6467-4ad7-bea1-67aa2b618e0c.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 0x8eab78d48a76ef2d6dc984fb6f330d8b0d4b735d970884426c53c4c6297c2b21. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFJ2425554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661f422728e248dd42c6b528dc707a408dab8c6bcadd3bb677f7d6137e94f660. 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/QZTB22585903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be9bf3464908a013a662470c086408f48b5a3e7da34859c7378390f702ebdcf. 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/QZTB22413370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf613272bd75e9d23b0ab7c7e059ce87098bad3fb063e99a5fc894c3a1377799. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZTAS2498963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35c50f2809dcd40332a09e32ef298adf622a5700ee9c9055243d90ce5229a82. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTAS2498965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08801c8174d82a099a0ead15926f7c195e1ea488dfe175bd7aef9fca73011f4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA82495922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f1092481149fa6410d24bdc7806b85d95fbd1ffc52811a83f1ff30a468c360. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZTAS2498967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f3cfe28201522b3799b0e82d6873ef6caadc1d90299760c3b44f8cee2a64cd. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZTAS2498970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bad3745b38cb5c4a262019726940f41adf848415e0098a0088a981e5f85ca4d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLS2441592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fafa2ae3041a4322c2eed6a1899873bd359dab8a0222fc9d8a4320e80f0692. 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/QZTBC2392674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb359e0e236cef3144632565b0e15e042b4f32844665e65c3eca3afd2225a9c1d. 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/QZTBC2392675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd1223d4930b149f6fd96854d213d6c67f900da0683ef98472fe1dc74033bd6. 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/QZTB72384071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bab9adc97d37226b9f24f113cd0d524bb18e8d14fc4681df190cf17a86decda. 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/QZTBC2392676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bad3745b38cb5c4a262019726940f41adf848415e0098a0088a981e5f85ca4d. 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/QZPLS2441592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84033a6ea51e8aa039d9b1d5529faae10a79f1ee0c73064fa9a989604bf59fe. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USACX2300436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f352eb69a24da52009ce04849cb1a5d34b79640c7bada7f711d7855d574a50. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTLA2446592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b58a60c8abd36abf1aea8dc77b98b3e213b446c273dd277c7a8c59960bb8847. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTB72225608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe031b886b16b7f6bcea6453d4c0e0e8660404e29df4880dba4fc584855d67bdf. 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/QZTB72225609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab2339eb1e5b2c589de4e7c2fcc30218d9604dd1af12d9ceb7dce8211f9e763. 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/QZTB72225611.