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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238d276ca86496f168f6d03ff93ecb8afebce6f362aeb28b88174a9b13958b2e. 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/4d6b4fce-5555-4782-9c5f-8a19282b8ac8.json and https://artists.proofprofile.net/proofs/artist/4d6b4fce-5555-4782-9c5f-8a19282b8ac8.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3e16f92bd77e3d6ed21a8346d13058160afebd547ab58145ebe39465a8e030. 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/ES71G1508089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cef1ffec3a16471eded0ecb82893ae865541baa61da5e1063bfcd0176a7b1a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1508090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9666e26cc88ac71113cc40ad0b915826733be609421103c412f8ccdb9665f18. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1508091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86170281ab6a09996103d5c940f4eb427bb4cf869fd93e58a8f58d9d1324ace8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G1508092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6ac16407b9ee27ef3ba8aa4b08b5d55122526840bb37b3bec432ca46465712. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G1508093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c3cd5aa44704b481b9834e59104ac8b81736ea3114512b463c8b9912e7a8ed. 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/ES71G1508094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6580984b46156e3e027dd30f73c751997ba36b7355441ed4dda9d0e45aa86a8d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G1508095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6421d21f2f6edcea98395d73f136914d75eabf407512259ce15063ad03df53. 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/ES71G1508096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a8afae64df46d24fd231a3510caa278284535b9d92b98e0811d56611c1cc3b. 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/ES71G1508097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf12f57d1f3c3a2787efab820b6022010aefdcdca7ea04cfb94bb3a72e4d042. 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/ES71G1508098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bc7edfadd2c2c1611be5a94ed264ec10f274294b4d35424bfe18b88e32d24a. 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/ES71G1508099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1020d8e2c863e0a425000fc062cc20b30cdf2344b3c91577086d0e4d50bc1bc. 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/ES71G1508100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5038261b112a8b7ada7793285a81a5d6a2113a8d21ba2c81c45064ee0fe2dbb5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G1508101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88eb8edfe327f471445f3ee6d229921be6d4ab36ad2ff90ab34be35595428346. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G1508102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3111290cd94f0ce2e24ae733a9a8225ddeee08b8956bfca3144c0b81799ec86d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G1508103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1096fa0ba0ec0b48306a71b61bd97b83aa91644397b3ca065f4090a3ae12f537. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G1508104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c190a648423090a3b6e74321b116a4ef072b9a921305bf04dfe4a122131efb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G1508105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb49971e8954187a59d93c7509785cff17e4fed364b3a9f5bd55bb8d4f2703dd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACI1561195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93512cbaea1a97dcdcb3dbc6aca2a2e519351cd38e22cfbbe3eb7ecb5436c680. 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/QZW9K2346088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242090a587e27f3f2bca20e95e45261fa155e358914afe86a12ac7adea6aec19. 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/QZGLS2370352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f16cbd0f9df20d09ccd4affed671c834b7fb40a345547ff623391f1ad0b821. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZFZ42313854.
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