thumb|Arms of Prince William, as used in Scotland. The galley in the 2nd and 3rd quarters represents the Lordship of the Isles thumb|Finlaggan on Islay was the seat of the Lords of the Isles under Cla
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 0xe97384fcc74c74a2c7ddff868790fb39dfaf8627da7e8abe88d8556812712931. 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/47066ce4-5761-4d95-a041-184562173f62.json and https://artists.proofprofile.net/proofs/artist/47066ce4-5761-4d95-a041-184562173f62.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 0xf41c3defcc6587d1d4f8f07e710cc67d81103b2c184c9752fbef446d3d0cc549. 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/USUZH1003906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa853b503ed587b633922ed52b6afc5de60df3431fb46352afd67d5e15d1ad35. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:09:00Z), 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/USUZH1003907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd389589679045782775342729ba146f95642e1a9cccec811e8d60f5f63d6c1e. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/FR2X42044212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9b21fe646ee79509fe627fe0ae5020ae5cf8c3f2b382946cec95bc035edeaa. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/DEG932203756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f1f845d669880f1f048973d86b522da3db17230144dbfc300e3415b51d9ef3. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/DEG932203759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848b1e6ea29f69ddd44ad12d244a36b9d3aa9a722bff1550a238329b127b872d. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:11:11Z), 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/DEG932203760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99476a0f3c01db5b2a91764c1702e9696c282e6f9978c84ec459a47313d6e6e6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEG932203761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78f8c545a45172f057710d5c9f03ff65728c8c541344a69f851b04f866aa677. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:11:44Z), 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/DEG932203764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4eb8a4408eb7fe0fe7e24fd07551fdbf8aa1ed0c111936c2f815918cb537f7. 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/DEG932203765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8ed0f7af4a24b0f29edb67a892c1d5bb02e49df0b168c37344992a7bc6a297. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/DEG932203766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9deef38794e087c49327ad2bcea81cc6ccc5b3d4cd29f40938bd1cdd7dde439. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEG932303178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae1869c672a9abcfb28dc0ceb8aaea181eb73eadf8543efa483bdd16192802b. 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/DEG932303180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85642e88f90ebb3935422c84f16780061d91385acde0fc9fa9e23e9a8ae2028e. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/DEG932303182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6261b860f75f2af477d24a72261020ece8e80c46abe93c006503efc464f25a6. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/GX4NV2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2313a020b58ce84b19bd5c9db17edb246591f67504cba9d7c7fed2c7216fd479. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/GX4NV2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f463ffeb51b8ad667e909bb30a9c71612561c7c9af4fe125b1feae5e786a8af. 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/GX4NV2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7ca50b0b069e31d6ec5b3b1b274646564e935aa29f9dfa03ccb74fd769b26. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GX4NV2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0834a94332754180f6274f92a7d23878530bbcdcdd3fc9d56e22447442978c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GX4NV2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2b476c7267be0acca6496cee5df9ef76d3d7e74789830ec9bcf28ab3b7fc71. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:03:38Z), 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/GX4NV2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb634bcedf66e205b180b03ccac24e7d7fbf33e04620ab7477ccb540074153288. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GX4NV2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d9780ee45a6aeb88d6ad42eefa1918c699e4002bebda6207808e870e66ca22. 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/GX4NV2100015.