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 0x44da2a70de132cf2ff370c41205198a91dacfe97d5c8a057c602064867182af0. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50eb6de3-602e-41e5-8684-30ad7f4be7e9.json and https://artists.proofprofile.net/proofs/artist/50eb6de3-602e-41e5-8684-30ad7f4be7e9.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 0xa8ad78bc1e77d06b5f091b4062f20d0ebd2b3456da4c0e4c7dd8de2bd440e0b6. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFN2492776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b149c2c05e4ef965c764c8c84a003d96bd8158f2e79b89767a58465b8de533b. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZWFL2425852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf535317ed885cadfdf2203421dc31ce516c76c105731f3aca0e2a12fef20f0f6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ772412381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a7c2baa0add4601ba0ed6bf9127b03a4b266990b40798476838c2f1a2b5edf. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZWFR2467192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120969d67ccafab9675141d7093e218925bdebfe25338d33c1add90783f91989. 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/QZWFR2467193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c307734c3880f26e4ab465e52c425e1ceffa47fe095d3e821e58d5a842afe6. 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/QZWFR2467194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b288bf0a8a741472b692d50e0e565e78bbcf785250372f13e058d4530766c91. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZWFR2467195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a02fbd7f42bd1cf9cc51eb96c861d384195e5eefd5d0ef949fa818962b9b1c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZWFR2467196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3516597a4902bb4c464f07a4960e9253338755e0f32dbad895a945268b820624. 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/QZPLR2513846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a7c2baa0add4601ba0ed6bf9127b03a4b266990b40798476838c2f1a2b5edf. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZWFR2467192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c307734c3880f26e4ab465e52c425e1ceffa47fe095d3e821e58d5a842afe6. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZWFR2467194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b288bf0a8a741472b692d50e0e565e78bbcf785250372f13e058d4530766c91. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZWFR2467195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a02fbd7f42bd1cf9cc51eb96c861d384195e5eefd5d0ef949fa818962b9b1c. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFR2467196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696f5360e07bc84738941953a0bc1aabfe01ec3eef1ab3e276f8db6531c48945. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZZ7V2517990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780684e7bf43840cffc1f6cdb890451aa7028d09621eebbebc02274e94749637. 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/QZZ7V2517993.