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 0x624870f943a386778a5d1a39b45e0851491b81973b965c2fac889add4a10a05f. 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/ef39e3de-0faf-4bc8-9460-1458794724d5.json and https://artists.proofprofile.net/proofs/artist/ef39e3de-0faf-4bc8-9460-1458794724d5.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 0x48d712fea9669be0840f692579c094709a59fa9e59a572b2e45e97b01fbd194d. 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/ES5070000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdffa9efdf3bb3cfc1a809ba0748a3c5cf24b2c7dc692b04de305fd8b698c0f. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/ES5070000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cec9cd92984ca1130768c092b9bcd752ab3f9f1613894810fcb3648ea9bd891. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ES5070000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434355ab58878562ebe8e24f04cd65eb550ec1c47b4c59224820f57d0e02ae93. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/TCAJG2540711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c4417f3d61b8d674dc31d7006dd4a1b7aec1e6fb196106c1768902c4b2c6a7. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/TCAJG2540715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb68c1ce932e633ff7e97839f0e0300678aaf43d268bfcf21ebe7d8e373f545a. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/TCAJG2540717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239567af32ac02e4a2f04773cf086adf191eff5675bd8d61faa5bce64550c19b. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAJG2540718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b46827bcfa6cd0ddc5a739d4994067436ca8dc9dec404cd64b484e6296401b. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAJG2540720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf1a67136d89f0f71169762f00127e1878c8d71a9aa8f995d2c27984923bca6. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAJG2540724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd681ba51af3754fc89f2fa81b0fe8242ed4c46143f5c0d06a061a1c27b890845. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/TCAJG2540726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9fd824c4e6d1106d117709b6dc3f6cd7c84ec0bd711512389e9e1f250419b9. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAJG2540728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8776bbfd110db218ca3855fe4eba2cc32676b6fb7f9247536fd339e066c401b. 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/TCAJG2540735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626624aed8c0070d5cbd4b9e4becae809fda9d9f110558606f1a8c646933863e. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAJG2540737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7217e05012892b12e1cb13de2a78c9817fda8d92b15b9493ae5b9b35bdb29af8. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/TCAJG2540741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e994d4ad4eb5f6959dc5952732fbdb5c162ce5d55d5d67e02b7981c825b8af. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/TCAJG2540756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc89108868a3ac92f3ce70939e1e63e739c98edf033d73f47c26549cbbc15c44. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM4TW1598313.