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 0xc436cf84f09f539532f482d0308190022aaf0817069109afded8b409c8811a84. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b00cb69-0d4b-4482-84e4-3170f7d7a564.json and https://artists.proofprofile.net/proofs/artist/5b00cb69-0d4b-4482-84e4-3170f7d7a564.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 0x218f88b32e52f495d16688977096c64aa3e2b1b56ca9c0a04232d654de6ea2e2. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/DEQ022281804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c865b0902c9ac2700d862fcd3c703d9460332d377c4747d8fdd9b7d667a4b23. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEQ022281807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e70fd8e2c9188959378c367abca280461e0b83200e409176c6978db0bbb274. 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/DEQ022391624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc831abe810d68a4943c56eaa28c5dbe3787356970e3846ca1fb84d299bf84af7. 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/DEQ022391626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8f534b5582b1003bab9cad12a4dc9ef882fd4b5eea551e30da2543178f65eb. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEQ022391628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21939108d5da17e5185b876b5ae1593fdfca3188f095a11dd4a770fa443f0ac. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEQ022391630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f52ec7c6844fc9ff08a3349a7d608ad49b18c05c00640a003c229dc9e96ac3e. 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/DEQ022391631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52e0de17005ff757f9a39b53bd1eb66a06742e5a68e3cda9a50e832854d2647. 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/DEQ022391633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a12a1d83ef95b72ca648762df650e6c1bd7db99198f08b91392381100f938b. 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/DEQ022391635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc6340231a593b2047abd3f115fdcd30ca28e5eb44654db70e375678816df4a. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FRX762550754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e12e241e721721457ed29acea39320094d0401b4c3b3360043ab1db92de151. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/FRX762550756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9fcb11d76081488aab615fdcf6b339fe07cb477f50add47ceef92811bf2830. 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/QM6N22420024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf8b196053107c92bacdca0c4cc0e3edb27499a2d7934e26d99c11409a093bf. 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/DEQ022284572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934637f4fe36db91549e6de8cc65ac912120420c1349d8898ec16a978898a703. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEQ022284573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e474b9bc0def87d92ab13708a32202bf82da65327cae13c61ef2cd96cc8a90d. 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/DEQ022284574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e133b3e4c960ad3538815536fd2ba4e3915743741a1ea263b00f1226daa61c0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEQ022284575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ca86e271cbb5bd969cd9014e3454dccd1ec1f3df7e4973b60c641d00d285b4. 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/DEQ022284576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b3fcbc3406eef30c6b1af30f9c4f77c40bdc1dab479e5048a9826350c9f49a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEQ022284577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5801c1ca30b238df4234dec1cf0a64eecf4abe2a987710d7d5cfa92386fb6779. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/DEQ022284578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9abda962fc84b59de79b95a63265aa62a96b22bf26ef10e8dd4c8456c56a7c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEQ022284579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24241b9beb46264bba8cb87f196d78a2f65698ca3de63a713385b8247de87e2b. 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/DEQ022284580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd0b46ea6acbd9b2ccf98afdd3b076c04cd6bf040c73da90c7af6b5d7ec1df9. 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/DEQ022284581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf885147f24d0016c56a075e8da65cd9b8df067fb3efab14775d0d193f116f8d3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEQ022284582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8973ed003515107a9d59c6708f4db19a73c4e6501a8ffc148cd703adcb7505e3. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEQ022284583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddacc367184ab7dd175482cdbefa4f3204909f86f43a90611a98b54167395cdc. 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/DEQ022284584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9fcb11d76081488aab615fdcf6b339fe07cb477f50add47ceef92811bf2830. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM6N22420024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487c75346bd6c307d25441aa784f7c7ffacf446352831a8c2ce94c2eda32eb74. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEQ022001627.