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 0x8d9eabf76c330b3be8444a2498d2d0e39d7482f715b7116e80f5dab5603076e6. 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/e50d4a62-9c62-430d-b15f-cacf3c84ff21.json and https://artists.proofprofile.net/proofs/artist/e50d4a62-9c62-430d-b15f-cacf3c84ff21.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 0x38179bcf13de5e06ab1e859bc1d08712fbf60d0a67d453a169e6a07a1be76c22. Chain 2 (Bitcoin): anchored in block 957835 (2026-07-13T09:48:24Z), 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/USLD91755978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16db4006cf92be512e7e37f29df14fb03e2cf35092a09179dd7cd28aed227f7e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USLD91755977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ae7a5e49a7ef4b01a98dd85b5bd432ee8eeea795168b94b4f325c4eef4ad32. 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/USLD91759306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bdc8b37e8334d0ff156f67b6dfb7b97e523368b8eb97a8e86515dff8f7637f. 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/USLD91760116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f9fa0bf91086c2e22299cfa8111b43b514c2b61d08bf4eea36bf7c0f25941d. 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/USLD91762430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bdc8b37e8334d0ff156f67b6dfb7b97e523368b8eb97a8e86515dff8f7637f. 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/USLD91760116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf041e2302dbe31837c2c6390e98f3b7fb82792bb111bca490d7573cd2b3f164b. 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/USLD91762429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f9fa0bf91086c2e22299cfa8111b43b514c2b61d08bf4eea36bf7c0f25941d. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USLD91762430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256939905e77b29b29e40d49afe0f2f54aaaf46b23f978d956799b96225b5e65. 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/USLD91762431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e5f3cc16cb244d0c059d7ac98fe0586566e42edc09f189da55271e48b6a4fd. 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/USLD91762432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a8c99c4de839be06d7593cdc82a934616ae32b77bbae08c1edaa603159f97b. 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/USLD91762433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e298f8406dc7efc00d0578a1478417031cce87d66a199d1e1a2dc43602935af. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USLD91765109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0cbeef726ae6eb7c931f7871eb847dd07fd57c150c62ad4d8fdb1d527ecd16. 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/USLD91765610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4de2b8474e4d53a43569424079f197d2c8fe6536d32178a258763873e91b53. 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/USLD91776311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbc0d639669538a4cadf099236121d9e7b8142df6f66950ef6bdacf82d283d7. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USLD91777595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c490f22199f82bca368a8265a52b3e6f1007cd37407d8fede80c805e02a362a. 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/USLD91777596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56535610b4138498c3373eabe8b2673d2ea3ea5632316d00744a09a8389749a7. 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/USLD91777597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d7cca8c71b9fc1cd62481b3cae17a44b98b5341c15708698fe690068424c03. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:44:03Z), 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/USLD91777598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e4bcf7e0e17fa7c9d90b0ae8a93492a87d7d145cfa77128ecf0c17137fdfdb. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:04:19Z), 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/USLD91777599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f36dddb251a7952786977dd7af6d03e8bf17ce9f4d1490ec9f268ac8391d66. 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/USLD91777600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524002fc3e3b237f880600b6b5e9ed1f643dfbed750fce7ca9d604b86e388c42. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T18:24:54Z), 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/USLD91777601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1a17496a758c78a2f27939e399b2ede2561df2909ff5030e11ea6e52407359. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USLD91752990.