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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73f9d54b10a7e2b483304d47d695a3af958d950feeaedcbeae8d78946ea7128. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c81954b-9285-4bc7-9e90-cffbf58ca2a4.json and https://artists.proofprofile.net/proofs/artist/4c81954b-9285-4bc7-9e90-cffbf58ca2a4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508255bb682efddaecfd99f6b06955da0be1003c2ebd0f57c4bfbe494712f958. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMHP2402102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261ee564e9873a92603e911619c66e062aa76dde68d21e292730c2e65da4dedc. 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/US3DF2470339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96deed83f87d96d675de9079002aded821adc00cbcefb5259d3b1172f2132fbb. 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/QM3DF2205692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe495b1138499e1be78315c55bc4617cc9cf9ee6ceceff07ef7ec54cdf71f4cbc. 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/USANG2243139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7bd781d8b67b5eccd0fe2c5f590b105fbdb951f9b02ad2cd0445d330aa16f6. 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/USANG2241640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0bff06595c9e579a22b03423dfdece2c3e23cfe887812007baaad1cca0ae7c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USANG2231820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5170532141712ef1b3270911c45b7a132078688a6503d6ecba5538328fa63d. 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/USANG2229731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf7836d99e81f77506163b5a087469d000799e66b3e1f4c53ff8b1ca297b662. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USANG2212234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0e455af719fc8c85ed9ac13eac1a45875db60d8ab9d27d09bc4e54d19cf10e. 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/US3DF2283244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86a96768ac543000c1bb94e371f4c129f42490281740b58abcaed7ad91d9c2a. 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/US3DF2267727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75d8fc022486829aee00ce3f9a44c9a9e95da0eae06f1c3466fa12a32263f44. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/US3DF2261645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d0cba1abac1d6067bafe75018ea04d0d28f1ce09f848343896c86884840093. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2249054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b3d39e92e37e62a129ecf4acb55d0007cf8828ff60926a50cd01c402264d4. 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/US3DF2245619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa565f580b4608bf620acc809cf54cef20a6cbe0b4d120bc2eb8cedbdc62f6689. 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/US3DF2247162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dae131101793b20730d793a5461914e8ac912ca4841b993253a0010357680f7. 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/US3DF2236688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52cd5a73354d6bb63f6920a51a00390e99d8250dfbf603f5118cb94839bb6f4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/US3DF2236689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fa319f79ad334240affd987104c6c73af025994f2e4a356fb902846aaaba67. 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/US3DF2236690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd715c3dd31475283f3965ef25d1bba24763c34424317d8f5d1dca67ab16dc12c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US3DF2236691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba948eb2762fe6a3e47398134f8c65a2d6d914d45e982ae5b20b8bafd80aff3. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/US3DF2236692.
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 0x48cd686418cc48a27ed808ab5a56b3869c89304d805535c6c0166fe7198f48d5. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/US3DF2236694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4032893faf5b74ef681360527c6219aa70c3e68494b938d036c65a00b1c448eb. 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/US3DF2213016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab137a8b0d0b663052298cc0498d4028e46b17634e32bbafb79410374223d7a8. 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/US3DF2212940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59925b03e7badf7620128a5fcd9b349cfc6f8f38e7a4df59acc929e617c35841. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US3DF2204532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ab2e189fa76e22a170a43be647b9e2666ae790e6aed6cced78e03368696ff5. 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/QM3DF2197464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4060c755286a2bf22c5c73d3ddc3a5d9186639b8ba54a1a8215b3cd97c035c17. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QM3DF2168491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b48620a5d3eb807848ab4b4c54007fedf3ab8dcc41f0439ef78f777c1233553. 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/QM42K2062189.