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 0xba07154e509c167b5503de0834fa99fcf11c015401fbd55c3957ccf7b13533b8. 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/a2e6aa76-b64a-49e1-8b55-7b6d28387716.json and https://artists.proofprofile.net/proofs/artist/a2e6aa76-b64a-49e1-8b55-7b6d28387716.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 0x2712a66a7110c0aa435728acfd72041b63aef35e7fab92f0867d372c0ed14e7d. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/ITAC21200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd8cdca85f7e04526a2e4da62da34dc41497a4aba743e4c9fbb384c18158bee. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/ITAC21200133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54af30c13e4b95f2f9aa84ee67b514820a33dc6d725a8d399d2e909ac1e87cf. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/ITAC21400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfe7fec603df6b5792c36dc1d37337e61a0340095bd45bf3a06f9e8186783ac. 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/ITAC21400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55e066e4ff72967bd0b550325ff4a77c7627244938a083bb50fe8ec6e75a59a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/ITAC21400173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e49a127c54fd84606a793fd8e0b8b670707ec5ecbfe8d12d0e396528da7134. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:55:41Z), 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/ES6601403911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529f9c5d318e83ab1a4839651b8d52188d4593ef1fd3f3356cf2b1b23f664083. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/ITAC21600028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c336df62531c71f915538bc6d106ea8f314ccea263b10995ac7c9a293cb91b2. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ITAC21600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e48f9aa2490cd1941bf47693ccdbbdd52077c627303776a7923ca4358c4f0c. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USA2P1928224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a570502447adda79d6cf7061fe7e5dc66c37c60d448dce3567599225dd17132. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZTPX2148336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570ae7249f9616b3e86fb8a7aae8c0765be99023e1f120a2a42d9f14b5ba88f3. 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/QZEZZ2100687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14df72c5297d7dc82dde7f990865549ba95a3f5e662868113f2ca1df68e5809. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CANXS2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba911317286e87984b416670395b46ae6763a32d50c97faf7e0009938b40c9c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZEZZ2200354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412f46f916b037508ed76a73500966dfe1244587ea8521df0ccd186054ebafbe. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTBD2464772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f795d9e539a345775e5675d53bace1ea60965f743249aa4d79427da0a595d5. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWQ2593786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd6b56dfb7a00f017cdddeb4696bcff7a80d8e88d7c31f43b0f843b2866f7db. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTB32523988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fc374c0fd8a1479dc9648f8751cc56946a61867f7846ecbd9f2f9379110442. 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/QM4TX2482063.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b401a59db4724ef0d62bc7401af9c59f8c26973d864fb1af7bfacf9add39f3c. 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/ITAC21600147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f940ff44dd9bd7f09e3fe31845eaa790d6dfc3cb2a1ef1c6e56f5a78943ce56. 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/QZGLS2393738.