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 0x983b70f8e7f2a217aa96a7ffdbdb1593fcd1d36f1af50788a35a10106bfcff7d. 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/9357b4d0-e5f4-4c77-869c-19e0d3284316.json and https://artists.proofprofile.net/proofs/artist/9357b4d0-e5f4-4c77-869c-19e0d3284316.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 0xcfcd8c0e849f44eb677fcf79dc23ebf3eb754f5fba053ec97ac7cf3b7adf197e. 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/US83Z2236609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffcb8c1078cbae503b8c2e73787ea77ab597447d15efc81b2ed1fb863c35a59. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/BK4DA2401372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2627872179f5eccc76782f17242377ee28ac4c54b2be1d1e098ddc2bd92f9b76. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/CA5KR2447135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845ed681607e03a3d4c97d6e1008b6f0835c4a5174cf32dec395a96a7bf0e3ca. 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/DEH742414938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35758a1de3cdec79bf7a58f3538d4aa12b93e0844dfa3567acaecba587701da2. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/US83Z2490286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b6d232b94d3c3aa745513d5d57b4514d75c9901b8bb18ce3c6d06431283397. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/US83Z2404248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4529a7626b7014035856d1485adedfbb12a6756a312308e491f69276dab270. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/CA5KR2500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27966a6b770beedcac61710c1be6b3f563f7571d81fbf5d267c9a46cc6e9871d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/GXBNP2510220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50a6e68dfe94e9af6620b65c53d739c484a20aa87ae8b330377f77c56e74b56. 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/BXG9S2500877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224cffdf55bdd68af4807c67c92e47d8ae0d2d7933f6baab60bcfc03b1b61414. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BXG9S2500879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fab56f0b09ab091a51940445ec8ccbd03d986916cbb393ac9d08863604cd99. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BCX4V2200084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f0d317103a16b840d459c0d52665fd06aeefcbea8601e9af235082f3b30ecd. 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/GBKQU2370181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fc45a8b98630b4a5b1b38baf15b42ef02990f8d00c714833b3f1bf4829091a. 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/GBKQU2337205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffa928ee5035e10b91f7aa4150c056ab190afccaca24df3775fe80e5c0cf97a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2513350.