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 0xd140a6fb2f04a78a754d70d5db1fc07e2e33b0ec13485db2cd535700e2d910b9. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a03af1f8-4d36-44dc-8c4e-c3ce31394bd3.json and https://artists.proofprofile.net/proofs/artist/a03af1f8-4d36-44dc-8c4e-c3ce31394bd3.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 0xae0ed910ef684e86c2d49b276d2d9a04a6e7407560f904119e57846bba3789cf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA371036011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa315733718bd03b4a53a318be6c085b78271cb4a618baca6808d3d3ec0bfdae8. 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/QM4DW1537624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3b1611ed031f3163edb1e1546095eeaa96c5ec94e233f1cb674fbb3fdca0b9. 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/QM4DW1537625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1f26f228e9cbf1c1e36e36609164aa05ee0ab0cc3b547318dfa3ba1aec6de3. 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/QM4DW1537626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e23b0b5690794cf4a24b440dd42c73db648e5fd8f9f397a940cfe6c273b80ce. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM4DW1537627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ca58cd35ca74920cdef96f89f91cdc1f97d58ffe79adc4790a20dfc6867662. 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/QM4DW1537632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa2cefae9b16196b8d7acf393b27c6d29b89bff8da7c0ac690e9fad265efce9. 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/QM4DW1537633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96eb11dd64c9683c387f4bf3f6280e94fd70b3d7db2f245eb9284c50bedfac1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM4DW1537615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96f018dd02874ab2dbd33bceb73b9a08117568120af74879ee47a84a16990ff. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM4DW1537617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e82134ea58f513008d1afe54e9d023d2754331a161451e81ade354b38d29f88. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM4DW1537618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905c51afe25e036c4a6fe62c69c91509e1193708406a4ec428e4fd922046c64d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM4DW1537587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7217dc2c020126275705b7b6600b18e22603a6ffc5f4a4c94ae5a4da64ebf93. 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/QM4DW1537588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408f8d5985c5d28a40c599962345e6afde8efad3b0034aa023f2ff474a27323f. 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/QM4DW1537589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2747d5071a04ee859083c6140df700cdadefccbd10a53ae47185c9b82f7c7d5f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ZAE490600032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4f7ab4c0d7addf65bb42ac7eb90062ff16dd7b9ecd21956b9b41e0413775f3. 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/ZAE490600033.