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 0x1d5a0630073f2edcc40efb7217dbe75d86da07589d6eb6da1c2b5eebae74b9c9. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a21fea6-bd1c-483a-bca1-4eb21ccc8032.json and https://artists.proofprofile.net/proofs/artist/2a21fea6-bd1c-483a-bca1-4eb21ccc8032.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 0xed0c3d08b3b9524592153c613570d1b56c9ce2a734d34a349cb0aae64bb31c50. 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/BXZ4A2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d31500348a8aa2a92c679d2150a21ab0315f73c1b0ef8b52cb76fa0b63da534. 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/BXZ4A2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f95afd53c68f7dc4881746f095410c82e5e13f51c6d1963ccdedee58be4cc9f. 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/BXZ4A2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63b2d0b76a1b55b75441ee6f53df55f1654b8e4ae7d5ede724d6e98b114d28d. 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/BXZ4A2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e4fc9b126cb5189658b624c8ccd7025668caabdcbf8cbb6014b5a1b4c69caa. 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/BXZ4A2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab515fb5dcb3ad497bd560ab74186bc769b1c2f76d7f100976b0c4555e450c13. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BXZ4A2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06e9c3d9f468c409911a9405f6fc66eb1ecef3de66eaa996db3546e72d0f55b. 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/BXZ4A2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b5ba261fdc502f07f15dedb87d518aacf601a2020268e754454d7cdf8c175c. 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/BRAGL2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22c7e001e6f6f9750626378cfd58b870d4883a7aad9b4162cb8dc557345c7bb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BRAGL2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3045d3a44e61c2571886b684cf1baa50d75ab9605b29aaf335fbc5ff728f69. 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/BRAGL2200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d744c9f78e86da78e756986b330308f70983d38fd19246c91a05364b4269051. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/BRAGL2200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4ea40b1109a23d9e055dba0dac3ee285d588292f56f21f032f5260aa4d8205. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BRAGL2200079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd069c72eda1742a83e3dce4f7cd9374f1d2ee0776b8027f905923b436810e7dd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BRAGL2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb14e729fa66c1c59e9e1fcb911660f38a8f9dd248f983ece7cebcc23fdeeff. 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/BRAGL2200081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085e44ce9cd3466d07e2c20a82ab99f3f45b5bfd425deadf94f772456465bf35. 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/BXUDJ2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4b2cd94226f6602b057175595c1c483d0f196180f446b16eede6f0897d65fb. 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/BXUDJ2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81caea85ca38ab4be047a1e931a120a27c60ed39c3ec1853b1f6ebb97e4700d9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BXUDJ2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49550adb47ad4118e42142047d82defd38bb04d4e92a5801f0e24d7c62ff28fa. 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/BXUDJ2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba68baa40dc62e66b6df17e38b564000fcf3bbc5e5701c961b7a11bca89b0e59. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BXUDJ2200003.