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 0x18d1fb7ddcb51764b31533725f0ad78503b82477f460598f970be35b0bc1d56d. 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/a285a9de-be8d-458c-8798-ecee2271850b.json and https://artists.proofprofile.net/proofs/artist/a285a9de-be8d-458c-8798-ecee2271850b.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 0xab8ee2f557615b1f329b526955eed0e559c98c977cc45070984ae97a1d6e47a5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF1823648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc250139ed6e812622c5262f27d4cc58deccb3aa1b7d696af186f11962d166f83. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF1823649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa086ac5bed15a89c6599b506b268b0cf2ee0b9e0f118732246b041aaa0c69f39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1823650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd0d8040a992744fee21d4f161eea69eb008c4c4485ec1d34040c9b150b83f2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF1823651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9cb458631e1aa281a3dc9f0ca69b213298fb069995ff74e635767399357fad. 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/US3DF1823658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282498ce09cd6cb258adbb823a4d8ca77a554c8cc87b34512ac401f4a4ecab52. 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/US3DF1820020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0017ed2955e067df565dc708ed7ba0d97b65c5030eb596465314768b9cb83263. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1820021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3612fac3aba6c7437cc22ca480721ae62dba761f943d11dc41109f33be0572. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF1820026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f8bff583ab3d400d71fd7afbad842be00d0a6cf3241a0b19eb413a0a1a0ef0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF1820033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5212be70fdda4973f95e10e2b86994d2d6657798c345dbb6fd94edf54ee3fb2b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF1817864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702301362926853205de4f81efee1f0e6cf1d4d8035297f4a01d23bdf81d2b6f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1817870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243909b04422dda64685014ce500b318bde4373bd5ccba5d1ec27f527056e53a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1817872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d33436c23642c3e5923b5e66e5af6ce2cbab79f13a9621b00f7f7b117641ba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1817875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc6c3ff537f3282f16281f33e4671a8b296a8b1a39b88cee28bb325a7ba0ae9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1817876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa282111ac50cd60d61c3acbe066e1f5e6303e5dfdec97687eded7bd4f6c512c1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF1984300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3520cc123212cb423d7add4ef1bc616e0fcafc585eb9046285bae7f629ae619. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US3DF1813922.