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 0xf0f3dfb17f410824163da99ab54cedb0940fc7e63ccff7a6c90ddc3dc7e4e4b2. 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/6b255e73-22f3-4b35-8cd2-be2d55a00972.json and https://artists.proofprofile.net/proofs/artist/6b255e73-22f3-4b35-8cd2-be2d55a00972.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 0x51906fa9526eb622b531d6ff150dd90188022f8567681e109e225ea462ae0142. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/DEA812000467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420472582164b43be842c2ce1b6e64af4bd289d1c47ce631345d295d76b61336. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/DEZC62042651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c50283435336b0f3de2fb233a50c18eddd00efdd1e2d1c6d8ac47528799912. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/DEZC62119537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ca7346931976735ffb5d3e7d163cfcdb4aeadad4b760093a691a5f5b75b642. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEZC62131202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf688c6470dfeab19d684681e986a4f1f2e1d5b58e6dae6501302fb9f18a2552d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DEZC62111623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5891c5344d885c4d349f627ffe0c7904d6dc920e0d55d5a86ba039d52cfe3b50. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/DEZC62264985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df220121935c31145d4e5b7b119d973cf6be05034c9f8cce84ebe378f874f53. 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/DEUM72204720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c82a1b131f630e43f9afa4a96cdfe41dbf062010e2d5ff4250491bae418560d. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/DEZC62358968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db0af2d0ff2358412ebb5541451f99f03e410caa2d907bd96d6119de83a3649. 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/DEZC62384644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1094be3e526f1d2557b48b06c34d8f9315a1bf3c7281c72ede5a9c6cf63a111. 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/DECE72303404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a25b29e48ed2cb4efaf7b272634c73d0aebcbc69f337a37aa97b35ee20f24b. 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/DEPI82114918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367058544707de2180162c62a69c019670252eebfff781a9062739cc8fca1942. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DELV42300807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1094be3e526f1d2557b48b06c34d8f9315a1bf3c7281c72ede5a9c6cf63a111. 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/DECE72303404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057026ba4ca2e338ea9cee09648c78db0021a214ace8621d23855c7da735c70b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DECE72400672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057026ba4ca2e338ea9cee09648c78db0021a214ace8621d23855c7da735c70b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DECE72400672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d604cc1e222b039a8ab9061044d8d3b2e9b202de6a147df559205b2bc5e15c. 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/DEUM72001464.