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 0xfc8c983f554e0857cc8ea354941aa6ab22d7f67a028a4d00286d807fa4001c3e. 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/6baa2ce9-2cda-459b-aae8-782f563aeb9b.json and https://artists.proofprofile.net/proofs/artist/6baa2ce9-2cda-459b-aae8-782f563aeb9b.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 0x1ccd541713adfa0873d80deba34172c2c366ef9aab9f78905749ccecaf3d3220. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWAE32400280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1142366008e5fba53bcf8de5908a421315697cb666118f69c40ef34bdb30c716. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TWAE32400281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cad1edaa77976380940c928c406d6c596e93eb47cf82a696073793592c237c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWAE32400282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa156b469f50fc8b477ae6eca7f5980d7b60e6c85ecf980d979eace2b56299ee5. 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/TWAE32400283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55643bf9c8b95f7112b31ed5d8865d59402143aed3bc6fe4018373495a335f45. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWAE32400284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fb594e291afd1da99b08d9b4a8f8d0937c51de02056c096d128dac40cb481a. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TWAE32400285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004c40a536b4f0a40caf641a7ca01de333f7b2da2d3240fd9b0eb15344e547db. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/TWAE32400286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b429444cc9085ac1790a29c21facc648c0199da0751e9e0a4cb14505f463a4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWAE32400287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc153b34c8ae760e2a67d34e303a17adbacdb606fe1cf5d74773f640d5e8909. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/TWAE32400288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c5ce6c1a8444ee2e6c22b2448205dca4bbfe0fd01b608f0bfc7cbe9a4fb371. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/TWAE32400289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe5b68572da38c91f5b1361df7ac3bd127c1f2be937767aa6b5138227b83865. 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/TWAE32400291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c28c309fed2045c230f4e7d1786e93a5c58d8e16fddf9f10ca554a3a047bcb0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TWAE32400292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8caf10d15fc375cc30f9b7de3dff78f72c438f9efc506be0ad47ab97e1921152. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZZ972314992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e13874c60363f70cf2b4253f753a376bb27ebeb2f542f8facbdc5e737d1469e. 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/CNZ632200856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2520da648e0ea863ef59b0a40391aac48c49cd2b69a5b52ac26576112a801b. 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/HKG732261843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf994a5a6cb0ad04fe0c55eb482c29a2bd3a34f5dffc02552365b161f94c4ba1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWAE32400973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2aca5b6b5c8dff7734882f0ba4cb7e8a296bedfc6a72645b77cd2f8696a26f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWAE32400970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555bf357cb1918e0af0e11a7e86301b378bf762ae7f2162b579b095426d7553e. 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/QZZ972319346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628864ac0e49823daa30a4d7da9228d11de2e8792500e9332a24e5cb718e472e. 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/CNZ852310857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68633a5ddf5292b81ca74daabb0fac21a87c2d0eaa3d30d9b3d669ea78e531f2. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/CNZ852204324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808643d2472fa1cc6f160d7fcd0a55be588b037dbe4f33e00973691b95438885. 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/CNZ852305644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90bed6bb6abcee3bb36846d45bcc36a58d1845031d78a392c0c4c59d1990c2. 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/CNZ852310269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4d35f38a38b8808d5b09d42cde7506f4d0caa5c2f2fc480a57b1a9d8cd0454. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/HKG732352516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47ab180908ea6bf5bab5997232adc068bb9bef191e687d83676513f9315ee39. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CNZ852309188.