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 0x80559242b9f8b38730479cd115314c8203fc99df91da9c63706a378e9636799a. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e69df7df-de06-4993-af63-c3977706e178.json and https://artists.proofprofile.net/proofs/artist/e69df7df-de06-4993-af63-c3977706e178.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 0x3b8c1eb175be34a3a0033ed25092801a9e493aedc9871ad5247cde40b9447adb. 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/HKG732295875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ce07f51c485623b97610b2f3594646eb01b39d6c018ec7f28f94225377f109. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/HKG732295876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d1368a59ec41c657a7656153a5d2b43de13cf84d04a692884714adcaa0657e. 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/HKG732295882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bd6a5b430d411d69d95f88f97efa3789215f1fdfbaa3f4fb0208b464c3f33c. 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/HKG732295155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da6f4e182ca159af8d3757d6dac77d1559397ac00b9cb992b637034df75726b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWDL71904957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d68b12df6f48afd166a50bb0330879526ed53e69062efbe2983efa0e9d6bc8. 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/QMBZ91716950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3562de64aacd3eeb136c119496c7221bd85187d2cc0155e0dfbb0b23952437a2. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG732295174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115399b3e5be7cca362ad90d4e277d533566056a65495ad877d114620f378701. 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/HKG732295178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340d0435f541ba3143c83a6250215afc33365d6e7ab9bf4c76c54505f0adc7a1. 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/HKG732295179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d6692ad170c0b8fb0f28bba06b4a0c149df0f07d1d9ee51f0cfaf806f41a14. 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/HKG731907192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf29f2c3ecffea84ab69734755711a13c61f068a7beb0ac93de50930a7b9db4a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HKG731907257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e8909a69e0a67b8245443af24dcd88e67cbebf94b735447d6e0803d981a220. 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/FR96X1802254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f52e0dbcfd8e6a73beb1ad7c4fc5ed81bf9525ffd2d2495fa1c8eafbe54556. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FR59R1831869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b530cc72388d338121f83c033b1b10dd1d3e110857d970172ca65959b2d074. 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/FR2X41872864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4491eb41dd046075c94ccbd46a93316ee65a3b4b776fa0ab81dbbf7716912f. 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/FR2X41855832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef534bf9c377dd014da85a02cb6d5bb3f5796943acb2ee09ece6f7fd17997329. 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/FR2X41829186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abd9d2f6a083afd8cc597eb3a715a485e6b3d270dbaee6e40ed70106f639065. 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/HKG732295802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb232418928ebf922072f5bfe7d36b042ce02f2f61bd4581895ee63fb08ec83f2. 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/HKG732295820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a5b16fb674f97f9db7cd6ded4c059eec8cae9781e53d2d3a7a83af1f33f52b. 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/HKG732295832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d182b5e653459fbe073c683a57ef2dc2c60ce38c075e66d0cb8fbcf2d8948a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWDL71701073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa519c28bce51dd5537ad7e447f612deb590a03646043a81270256d8c023a18. 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/TWDL71701146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825f76324c18a5329e52c5f2b5273bd88e1707ff6c080093a1c125dfbb827322. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWDL71701354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e2c1937b52ec8ed44d813bada3e4fcb8dcd03f1d9467fecc227b1c28abe015. 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/HKG732295834.