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 0x6554a00ef417018bce0f876959858bc7e153392e01c6419bd7d41790caaee0e3. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b88cd450-e0a1-49c0-ba47-7416e90c38e1.json and https://artists.proofprofile.net/proofs/artist/b88cd450-e0a1-49c0-ba47-7416e90c38e1.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 0xd5892102445daffe4e7d99e789dcbfab6243adaaaab7bccaa904469c3697f1f1. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/US4TA2300086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb045e412272ed165be7bf3b02cddf763776eb0b33af0bc22f17b76c3f33f0b7e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US4TA2300088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9106f7c18d3ababb46c22b6d03a8c6ec80f0cd3f77e18aa4acb6bbd372a098. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US4TA2400000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12980f55caf14cdd39f55009636f117db44a932d741a553948a9f8be5978ddec. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/US4TA2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89da34b4a97ba45a08aad68273e27dac6b7f8f09d8bb6922594bbbe68ab7887d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US4TA2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d4b13bb4ab87902f35e67b91c136595de3eda9cbe3d7c20357711d026f5f95. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US4TA2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80e87779b9ae43f63d6b29b9092d506c95387b5bdc0dc51217b6c5cddcd0972. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US4TA2500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb045e412272ed165be7bf3b02cddf763776eb0b33af0bc22f17b76c3f33f0b7e. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/US4TA2300088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d3a556cb23ad79359cdd5f85f219e3ba0a6fc48dce3f18b1f14976072490d6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US4TA2500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783b975f4b60fa4d22466837b36e61793c96ed77ed98abfd91cad383add4cca1. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/US4TA2500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25112e9c81af7241e497f15201c311a451dddeb048fee7ece7d2132fa01d20bb. 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/US4TA2500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80e87779b9ae43f63d6b29b9092d506c95387b5bdc0dc51217b6c5cddcd0972. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US4TA2500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaf81e6b5cdafbd5b3d8ab4a1e86bc46d5283805428033834ce0e0d60705f5a. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/US4TA2500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5892102445daffe4e7d99e789dcbfab6243adaaaab7bccaa904469c3697f1f1. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US4TA2300086.