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 0x74d48d3e95095106d94d4f12cb8af5bb43dcbfc95d95ab8b5163b07608774b41. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4405afbd-f81e-470f-893c-50b6f19a4dbd.json and https://artists.proofprofile.net/proofs/artist/4405afbd-f81e-470f-893c-50b6f19a4dbd.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 0x64b3b9d4da1d0ff3bc40a415c1965a665902b8056b666ca0aa7c37a225e1c681. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBLV61905665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4feb685c63467f019a03e77e14f3704495a5548d9685520d7ba640b5b9eb94f1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBLV61905666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c62e88bc21e4d1ce16eb8b5c355373e07e08b59815c2a64599941ea27745601. 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/CA5KR2301880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa16e4c1850e75ddc5bfd0060f54550f4ed4ebe58c8f04ef4a7aec88f7494297. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2357640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456b2b35b5fa4277c45efb07013f951fa1a5edb6e3b3821253726e4062061e27. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA5KR2338996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe97275ad286d7160d2b9f461a017c2e340cf30182e92be3681a3f3f682b1f3f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BCKS52200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0484f09af904614b91d7726a5e0585c1bdec976a9d5885204891084e4271fe49. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLRD52118332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08df24fc6d913128153646f03adac9dfbe9f8a72100d9ed1ae324012275d58d3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHZ42269080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157d13c5fe0f05ad598fefaf8eb5ce0e4e6ca6c92350139ce06d129b5502d082. 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/ATEK02199060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f933c38b41944bdc0faf0c5c14804fe426f6b65b33b620bc75ee29e02e565eb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJW2125486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c62582c846112291f2ae863e8dea26a1b0d47fa63e919a7fcc251b14c9b2ed3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BC1AU2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd70812e7416f53a7249a5661a45bde9d13d688d16b1e9ff17a52e1681ca94f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHZ52143324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb7bc97bfd85442c4772b0713b6eb406f7869f54b7f6fe0b9f718a8c4f61e2c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBLV61916300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94b392e54a216bd224fd0879d92c02f5cdaa3f93f542f2ab9f1246738b2cde1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZKDK2066451.