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 0xdb419822a4febc0d99193cdad730ca824f860d4bd6bc3231f2581f60d77ddf72. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a3b58df-146c-41e4-9590-bee7c08d5593.json and https://artists.proofprofile.net/proofs/artist/6a3b58df-146c-41e4-9590-bee7c08d5593.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 0x8a144ac754d6b7d78f399f745546999b23af0b7be64086d29e0879b1e93cca7a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAS2442208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e6a9fb6fa4f0ff5b26d23eef50ef9ba59982c1414947ad350c96b1a7abfa32. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFF2435753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373c195aa5190da4745e38cf7ddccf8e2cca1bf7687664cad577a9080894ba2. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZDA52502534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f19d30a33f461e31965773b46f8f2e8eb74947ee61a405491fae2a7b874cff7. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZDA52504483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956b9f101e982c0f11466f1e86d6f1be1731e0852b6a2d193932cb6babd04db0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA52504458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443e216ed4158cc6968dccdb1d1a627aba898aa8da9b3014ed76c48275749886. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZDA82517105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27abc127ddd851987f2317438b737488a973b53dac4cd88ca516bcb3a4446d22. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZES82575597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e864cb68db11de2343fda1a9bdcb0a4f6db99ecf8bb66be98dae96799fd229. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZHNC2517527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68af38c7731b7ffaa8c58470dce089c812406d1ad5de44663f53317d2764f914. 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/QZK6M2569122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b07f41b807803a9dfa49da372a1059541b958ee4d7b055f596453301f47930. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEN2581395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf08e325d4404928e2f758432962024cf9e7fba5f3842a0300d44b5015e200f0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZMEN2581396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7170413a65b2b700b54088e549f2fdba6703b479ec6f4bbab6ce769052e626ee. 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/QZTAS2444607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93a68dacd86d739df947cb27b888adb8bb8e0eff79c3013efaa2fbb8e196e84. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTAZ2552553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210dab2b459e8f50b9dff0256983033c68463e2c53532ce6e9cd16589f9f9389. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3F62525250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0738cfbea1860ee13a1e4bc03a480f8fd2ab25f6fd1ce1d631badedeef0da1d8. 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/QT3F62525430.