thumb|11th-century Italian carved elephant tusk, Louvre. thumb|Cylindrical ivory casket, Siculo-Arabic, Hunt Museum. Ivory is a hard, white material from the tusks (traditionally from elephants) and
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 0x16a64ca70eb55291ece1f788fbda9b112257f5d38e09861f8eea4dcccc3a29e2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dff52df8-c86b-438a-b375-958db9e615bf.json and https://artists.proofprofile.net/proofs/artist/dff52df8-c86b-438a-b375-958db9e615bf.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 0x91958d9cd4e7fa24bf878c138dca54370d92fe41a00d1fc8ebc040d23081602b. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:33:38Z), 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/GXHG92567480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f95b13cb2ba6e44eacdd858a22a5295cdd9333e9b7d23870dfedc14c65990bd. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/GXHG92567481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5278bc2e692a25886a7926d225441aca8fc26296de9773c71a298a7488ec34. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T06:42:06Z), 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/GXHG92567482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bc6f63617d6fa6be50af831cafa55c95ee87b469827874e1b03557d279c375. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GXHG92567483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d79cec9db88ecc025c30f0b5f22e256ea79216785da93629973199d78f08614. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GXHG92567484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849b09ba10a004687143b856c0fd48927108680fa99a7439339af1b0c91a2be6. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:44:36Z), 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/GXHG92567485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128472caa1938a263497b792b93b493388dd62d55505288fc36fda09ef2486c5. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/GXHG92567486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966a3149a90eef24920f7c3692eb51fc470445496a2c4ce64b03a9dc9bf2a8a8. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/GXHG92567487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56107fedc22135df08f659c9847dc308231963246374e95240b12ce6ab9664. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T23:34:55Z), 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/GXHG92567488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8b9b00a5a14a45db082c2f8b5de665928b39020ae8b111cae7b4f6def0c7e9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GXHG92567489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e301efef44401361dddac26ce1d038f74f9d391019bebf59596c9a3ea3ff71. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:34:32Z), 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/GXHG92567490.