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 0x0a1d46fb716525881467d3398dd5711faa15f6ce54539d84ba6ae3c5e24761bf. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c20b96b-7d27-4009-abd2-e097d8d4e604.json and https://artists.proofprofile.net/proofs/artist/5c20b96b-7d27-4009-abd2-e097d8d4e604.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 0x8f1c5c805b77b14c88113c68f6b79dd312d14e5cea6ff32b35cc9bec7ea2402b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES5770608347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cbc5a593326e40f77d73a09b5ceceb72f3ac968329be4037ed9d1d4d4d5583. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ES5770608349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468da600ae416d0d536ff079e889225cf0fdeb08c101836de732a125b5e52117. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES5770608368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92658080af7306998e2cdf5d21c14e2852976af65373827ef2a7eccdfab439dc. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES5770608506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfaee803eeed6c2f8505968efe46cdc6464a9c34c9cb8f014f86f6175270c7a. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/ES5770608578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392f85ec961862fb5ea93ab042f1eb8abec58b8e3e6b79b31b37db5aaa34b0bb. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/ES5770608626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771d6e57945c360060763163263fd924fefae3726b23a94c923a5a08ab0e7d23. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/ES5770608640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb04adfd6e63cf797bffe33810051422f2e7106a0392100475eb3ab74d717bd6. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES5770608715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4b3ea7f912458396451d15b943c3e404bc0c2184425a96a5ea8437b2e0c461. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ES5770608747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfefb863ba0e382d77f0bf66e3534b5a56b44c7d7c9376b1c76220f8232aed03. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ES5770608857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c1e5d4530dd9a28161c1eb32b7d091247a2807c3dcffe41de47b6db1481506. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/ES5770608938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33473b8077530c3338e570fd800a7f79e454974c99ffd2558d8b917ea4bd6009. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ES5770608939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c17b549e3de03aabb52bbc30107007d484e7081cd7cc2f6bee92f9796d6e11. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES5770609125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd380b20fbba6513453ea4cf3e2691e35d6ecda3dde6f6bdfb83e73da580e72. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/ES5770609163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eba790dd7c0e1a478785ee0d5bbf13a213334550fdcbe8d578d0e6ea9e7fc5c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/ES5770609215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39706b204c4b4852131a72a574429a0e0daba9cf533da3121fdacdb6ba13c0e9. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ES5770609216.