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 0x07bbd56fd87f2d5612566f1b296e1d914607dad35848fe583fad6b976c15f171. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a91eb31d-4ce0-46ac-b9dd-04f385cea507.json and https://artists.proofprofile.net/proofs/artist/a91eb31d-4ce0-46ac-b9dd-04f385cea507.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 0x9139cdb393ead2e0f19a73602b8a2aa2315951e8f54e5155c20804278f328c38. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BXBTQ1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1e0b655b67a9ebb8342dbe0e388ca127a1634ee2e3573cac34e56b67bb233b. 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/US7VG1790426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624b80b2c78be16dc6b2cdef76af45763d668d08abedd5e4483a1bdac0774c00. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BXBTQ1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0306ec29f8ee17cbc488146deaa4ff6b8a2bc5d8083937166e649d8e601a264. 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/BXBTQ1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1628090e5fadc7d129f98e6a02de5f0e2b6b2104d322548ac002d4d2c453f1a. 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/BR3751900227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53065d5612458e07fd9862ab93517a6121dc7b6c3763900bbb5467426e54d1e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BR3751900228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9652f443dfbaf4d35777258d3a7be677bb1008cbbc563fcab1b451664cd82e9d. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/BR3752000120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4799e4035da4ade6ad9c2aec71e24933412906c30573504adcd6bf3e5c4d5e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/BR3752100248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c19b876a5efa1d9fb93fb3fe8813e3b3936d1378e85100ce66ccafc8382ffd2. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/BCBQQ2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b315dccedbdc5662176a659a11806f698bc9a1036a50b02fe3d26266a6f8253. 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/BCBQQ2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4844e649c0ee7b59d1eba77cd911aa8243abea3d4da10907b3bf0233c219cb31. 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/QZ5AB2339816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b163ba9256eb34906d32ec1c5dfd7f14ed75927db5921d3c4fd1a1b3d52ebfb. 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/QZMZ92426855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fbd9f6e528e28b03202d88471b791d25227836e0d88aa248f4903fd8cb6171. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/BCBQQ2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2806d758c3d600f1f58f3816758ce28081649331dca0a04c5755744e5aa642. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/BCBQQ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762cab206131ea67d6bc03c636d75c8714c016dc6c7a9cdf27d966ac237861bf. 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/BCBQQ2500002.