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 0x9da6b016dab1934b571ecb1a9aaa0eaa7a198b8ada3c286f907b66c681066e16. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30aa75dc-21c3-4547-8a3a-82fb1ed46516.json and https://artists.proofprofile.net/proofs/artist/30aa75dc-21c3-4547-8a3a-82fb1ed46516.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 0x9f10ae46f0e737675dbfe284db26adc17e79531f5be02dab8c9a2fab046a0301. 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/TCJPV2352575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c362be5bf5f88c1050bd8f5aa394de1107546da39b26e127b5fc902dc9c92b0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCJPK2034213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dfb68fed5eadd6ba895ae9932ccf5ebb75abb4c1e81871e636a29117de4c91. 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/TCJPV2376967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f2891ca8467f0def593744d3417101dabf7a873191f4f046482fddcf9cb4b5. 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/TCJPV2376987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dca3ac5b106302a57739058e8b9efdd25e89c16ac4ce6cb5536718b7e469a9. 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/TCJPV2377009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc781f59a8ba3f59dd71d21b9edd13c346b3fc94a62101fb430d1b6edc7754288. 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/TCJPV2377025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8b65d3720a6306297707607532c00a6ded575b4e0cbb5e46eb92a9f5724bee. 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/TCJPV2377076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bc204e3484439c1b96b1e38900baf74c383e3740f2313987166734084c0754. 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/TCJPV2377088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cda35fe73f31d4e64776ab3a332cf4c2c236965783713c2140c927e2f7548a9. 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/TCJPV2377105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b377ac8dc5e356ed4c2cef6eb51bc0a6cfeb7889746cdc2e89ac67062de2d19. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCJPV2377121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdc6748559de68ff1b4777a7dad578736024c65aa03ecc13804af678855f8ca. 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/TCJPV2377178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fec98f3f0dbfcf4d57719033dfb0168c7ce6b1f8489ce367d148d84207c3459. 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/TCJPV2377184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d7d033779693052da284818d8c7028ee95a79382c0e447bdb689197c1d132d. 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/TCJPV2377200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8828092d997f066223758e5a7c24227bad4054a397c69bce3697466d4cde18. 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/TCJPV2377212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af1d2322948ccab82293892e5cfa86be2b7fd493cd1a2050cf0b65eb61a480e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCJPV2377219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47d6ba8317c939f15843aff04ac9d2e30f5182d66be0701f9c29aa617dcdf44. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TCJPV2377232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abcdff31ff2d049dcc84cafceda3f3dc20552f66d576c843c659a7030fdba14. 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/TCJPV2377238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854e46de2b81c55cfac487b67cdc50c8075f067d4bf8d5187d71bda070cc5a3e. 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/TCJPV2377247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5e2ed0cd608a4a7ed606d35b603555e4bae5feb7ff91f8b09b375d23754a33. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCJPV2377259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821021a5341df86d284be6151b2d2ce89bb92423696b8c57f1571acbdec38865. 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/TCJPV2377288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c639e9f28efc7bc74922c88b207506446a4a06c62aa7c033bb1bae39d06d09. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCJPV2377298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0493bd87f794e170be929e7e6f09df6187fa15b7f4ba2c0076bd16aa0189c7c. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/TCJPV2377303.