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 0xf95521590ca153538b0354a6c404eb446703df57c649d6b252b10e2f5b49110b. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afda9fd7-f4cc-47a2-a239-d2d818125bd0.json and https://artists.proofprofile.net/proofs/artist/afda9fd7-f4cc-47a2-a239-d2d818125bd0.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 0xaf9d0670d13719f2999908ba25fb8bec1b0b733580548a42298fbe88ce3f1894. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BKD6I2400157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449783119a5ea594fa69ef1b0d6b57caeeb3a912a1a8551a64107efc6632bbb6. 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/BXS0B2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec4bff4f36f367ebca463cd0f3d52481b113b936dc247cdbc76b6a8b846acf7. 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/BXS0B2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1358abbd8722af9271772552f3ee57821ca473c9a93c23122d217cba40a4ea. 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/BXS0B2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d59504ba3f6b6d969cb01b31a9c2abf9f0110b37370269e24d52b77def299bd. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BXS0B2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e8414ac29946a6bbbd935ac66401b96ca5f711b9d1bb649b9936afee3e83ff. 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/BXS0B2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05f4592196ae11f7066464fc3e8663f093dce2b29f97bc82afdd8fe3e1c6ec3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BKD6I2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2f9c3243ea4743e1eadc407cd03eae19563a52c2f433b8d69e73d1d7ddc230. 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/BXS0B2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461392ea7cc4f03f33232148f96753618cb403ac88deaa65281b13e169bd9fc4. 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/BXS0B2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df5684f32ff668335ee2824c08d716698d710aa51094cca95e3f359a5f52562. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BXS0B2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828f9ab287d68b23f354304a004704f839ef312838078bb947765f04c7754491. 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/BXS0B2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9911d832fcc2b3c02fed1114358c5a770a5f0343841f10b640774b616b39ff. 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/BXS0B2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1648bdb3106aafa92d029fde337ed65e2a76d6724b6be06b5acd323e289d9785. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BXS0B2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8e00bba7d81b3ac147354ebd6529f2f7a14ec1024329d57d6b74a416fbe19d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BXS0B2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863ce1fe25f5c1b7a31ea95d3f30c4f1747cfbd008956bbb0f2f9c5149d0168d. 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/BXS0B2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21188ff84a50aa1f50c9c58bec3a13a9b3c6d111d199f2cfa06029c547172d7a. 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/BXS0B2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9e12a0bf913a0bf2f5904ae6bbec856c75805c9a7e1fbc6d3e4a4ce95b1604. 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/BXS0B2400010.