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 0x90078c0f1c390c0ed10b61b34eb422e3a5b6a00f68328786b5a43d9218ad3e46. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cdecdd5-11d8-45c6-b628-21c519471552.json and https://artists.proofprofile.net/proofs/artist/0cdecdd5-11d8-45c6-b628-21c519471552.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 0x8f2230af7a3ccee9df592487371e4e88d397d97a88faeb829bbc74b2f684f428. 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/USMBR0603906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75904349ce6410053d9dafc6e41b2ec5f3fb06c830bd1acca60e624d7cb58dca. 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/USMBR0603907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a91b3270a7a6711a4b0a7587f46dd9647746e7432f3e8d42043eecd79f6aaf. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USMBR0603908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5123b81acb3e803e65d8622ec443bd87775a6d6180ea386cc2fae57b91bca91c. 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/USMBR0603909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8d8caa37142eb7be3410daf7330ca2b3bb30965973c845c8da41f7f0e2e620. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USMBR0603910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb760fdf3da5914ca07cf96f686629c86d25609ea30e6a62a5a1f6d8e91052c08. 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/USMBR0603911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7cab351cac54d0792b06fba9d70d7b48347e6365388879f3b03804c531fdfc. 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/USMBR0603912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b19869e4b56070a752d7c41e44aeb8b54fba40ab5518a5a4f0bdbec9fb4923. 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/USMBR0603913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f5914d2bfa7c578108a654cf9fb40194dc4a1e13f8810cd2c9f0886f5ee40e. 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/USMBR0603914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473164102f6c09decdaa029d8fd1044639c1e5c8e1b9907cbedaa119ae575379. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USMBR0603915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ceb03ec2f8fcd4e6522dd08239c556daf4286993150d1a6c7769a5c8778ff89. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USMBR0603916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36bac9ec913dbe311453341e9e8e6d3a405c89c6f4bbf592dc88a7b4864ebfe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USMBR0604067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc0c40ccb82beab13994aa471aad8c29e3f17d5ec1bf246254afe840f0e9069. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USMBR0604068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784950ce6adba3912ad0676ad621faf3655e0182ae015969e1d85baf9d9edd33. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USMBR0604069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a79cb7c66b43ab6af854ea921c1d8e1061e86bac739a22680c2623840846f9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USMBR0604070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e6cf2e7d065445649ab7ae37e75c5c157b9f3e0d82537c47e44c05930d8e1a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USMBR0604071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf309c8c1608e5d087101b98a6027ad1faea9e9971720efa7b5928153fd0efbd. 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/USMBR0604072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd670b29f8a89ab00fd959388a6db9fba829c18dd18263ee2c20137b0c5fb1e48. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USMBR0604073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b66a839e95700d3dff49a3cc71467ad8da4547129d6133f336fa7c56680b3d. 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/USMBR0604074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb280a685fb9e77fcc35333864922d3cfeab64ed19fdc97d0c809546b5c4f8d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USMBR0604075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1729d79df520376f9be1d893b9dd650a98198a3f671f7a007cc8d2c598568b89. 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/USMBR0604076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9ad9682dfdfc87209133850c2f54b7aed6551736ba82d8e29e96c590877a62. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USMBR0604077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af3083d46a81273c494882b41167fc4b9d42d26f7f4d1a5e7d566bc54bf3262. 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/USMBR0604078.