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 0x94f1baf814cca8e61bf30c148de23d0d83907d3a7446c4c4b0636ae5f0525459. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5b6b549-a310-498f-833b-e90f1081a047.json and https://artists.proofprofile.net/proofs/artist/c5b6b549-a310-498f-833b-e90f1081a047.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 0x7ce32a11a1131b9ba566c5035331ba0659cd3740b64ae235a83fb4794a5ce764. 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/ES71G1835597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26144a34fe0d23dede1a4b93a3d57a96f1b87cdca76130a74f456721b22396b9. 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/ES71G1835598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aad3511dd7e11f3d41f324b0ee87e606dc18a64ed1309a49f5f8b0a7e6dd38. 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/ES71G1835599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad37cb48be25e246227ee81a2127d1548060c8d8bfad50048f077efc5c3c4c4e. 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/ES71G1835600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b8851c12c40d0a39c2e5477d4718b164d4e0be791f09a63b95e24ef6351bb2. 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/ES71G1835601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020e1baa364c6619dce83669d5885d0acc8588e2a9022600d8f385299ffce629. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:29:42Z), 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/ES71G1835602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b87b75514b9528effac095e0cc9e8a356bb4ed9d9daf2c094719056ce209542. 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/ES71G1835603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d70faed99e6c3bd4b00603abfeb67acbede0461472ec8dd6c7655ada6121e55. 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/ES71G1835604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911a59f4b91f69e248773340c0f1e50c4cfb5dff7c35be113d8b69d86ae4da3c. 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/ES71G1835605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9cbcdcf7fa82ed6a6aeea808ecbccb7b89809568fe90db524c2a91963e57e2. 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/ES71G1835607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26068626a1630d14447a0f19fad2cd5533cec44d1d5b49f1d64a513b31cc4c3. 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/ES71G1835608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd767a29b9088831814dd1aed85a4859b6cef51e5bb807677062e7c73b2f21d. 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/ES71G1845349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431174f9f9d25993b9a35339003c03dfc0aba42190a6d4ec16b4b574ca511bab. 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/ES71G1845350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cb2c05a24cefb6c349c6cb419e14f9af531dd4d7b594316fdbf36e925dff9f. 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/ES71G1939213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e4bc6f617d042cbd74d40d13162c8dbabda447671f7a9d005605490f24f570. 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/ES71G1939215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e295e526d206dc086bc2aa0edaa026dfe7c9d7fb9f1321b32634730451ca945. 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/USCGJ1793981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5eec332213b7b6ed1030de214e2cd4ffad3b2ea156b3d885b74377badcb509. 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/USCGJ1793986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406ed93b87a1203f1c11a84e7516d541ab7684756cf6a3da1e357c6dc15f7f68. 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/USCGJ1793991.