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 0x6c42c46316d41b70d7124bdb38fbecf0a4ced69f8c3e8ee9785992afceeda9f3. 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/f3db1856-d2a3-414d-9cbc-cf6490009e6c.json and https://artists.proofprofile.net/proofs/artist/f3db1856-d2a3-414d-9cbc-cf6490009e6c.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 0x321edc3020ec70b9a3c3c6fc0898a95a612cc9f992dcde5f60ef86c14a082365. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/USTC40884259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81e2c09000725e00e7f33038bdc3db7972951dc51530b3990b7439af275edff. 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/USTC60812130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73858996b954d6143f4b0839008a4e053af10943c76653e0bd2c26df107e2079. 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/USTC60812135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c07a1dcd969ad0f5f5612cc0aef1664df58244a63ec24e51fd63528547f16ac. 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/USTC60812138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd5ce0493da4cfaf10eecf6d714d4e813dc138c4f2a353e8686bcd55bcde42a. 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/USTC60812153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19463e4c3fc1132ce5962c71acd60a72b398ac198b7f715a380f1b8cc25f9711. 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/USTC60812159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dedc1fc9564a886acdf1a53ebacb71adcc0cb14d594f4e589c09b51b23cd081. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USTC60812161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68eebbe1543cdcd5f0dcda6ff46ad9e794d7c09bbe871f72227926f1935402b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USTC60813383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1f72b37805a70eaf1c1e53ea6249036ee39de5408eedf3d3fa1491c7f39798. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USTC60813385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d026c2f789a92a712768d69cafe84473dfe30ba09f7631daee81f6f4e0003a. 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/USTC60813386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916762b2460cd71c99632206c08ce026d1c95e61ef93ce1c96c70d349fce6879. 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/USTC60813387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbab14e33168f0e57a73c93891905e87f4d81e3dc62ea65f2cdc82e8ef55dca. 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/USTC60813388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f3bd6d83f8eb7524780933323ca3b0b94c8a33278d6159b4d731eea55327f3. 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/USTC60813389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65b82c9497f9a0b7e8c6b01c64399115f8a8da5e2ce7c53446867a2c78f48e1. 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/USTC60813390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac963669da6aecd8e83d9da3b10724889e9e9320c146826cd479569fc46d9fd. 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/USTC60813391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953afc283780b6305104a52b4e5b6fac26780da16a18e9fcef46d03647b3f579. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USTC60813393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd93bef108a7da8b7314df58e574362cc803f5f808280bf222621e91c11a57d8. 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/USTC60813395.