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 0x610a18db91a1f2f4e26380766c4e3b20f83cf17b9ede6c42c6163a5e82edc3ff. 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/cc3ca8b0-6021-45ca-93fa-8dd81d07e743.json and https://artists.proofprofile.net/proofs/artist/cc3ca8b0-6021-45ca-93fa-8dd81d07e743.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 0x2c5106933d1e02f1765a0deb834108975f4c9ff6fd5bd96235bcb22bda93e0be. 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/QZES91837111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754381ccc9200b1b4a5092c60ff1daef3a55b9358390005fa50bb49c04ed0c9c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZHN61993546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c055469a6cf3ab453e0ca742e87f158d788f9efa3bfdb27c83003490847bd77. 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/USOT10402146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde4288cb599904f471cfe7d57a8fafe3ead324b9242d2fa3155bec1a47745d3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USOT10402147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be313dafd455dd055ac9c890c5003f9747c43c182cf7e138e9f85ee85b9d62d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USOT10402157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0523bc01606622d6accb38c2884702e3beb4720bf236410a8fd2c7046a761029. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USOT10402156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7509cb2f4c9e224390265546e4c7f9888762e66140a99e0628b21ed0bf3b80. 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/USOT10402159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2a6b818ad5d74dd694ed4da18d1abb0be36bcf8bcb91d6b9916bce492cd980. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USOT10402173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be313dafd455dd055ac9c890c5003f9747c43c182cf7e138e9f85ee85b9d62d. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USOT10402157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935c31e44d6039bcef68fa8ed4dfde54441cd151edaf93468a9118ecb8462e50. 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/USOT10402165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa44422fb93b87116b7670507fb59399e20ed1476816c4b5e43be94eaca529ce. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USOT10402166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d2ac325a790735f57b1b5a7dd3978ae13e5c4e5d89d8a6fb074eef1defdd73. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:48:21Z), 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/USOT10402193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7509cb2f4c9e224390265546e4c7f9888762e66140a99e0628b21ed0bf3b80. 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/USOT10402159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde4288cb599904f471cfe7d57a8fafe3ead324b9242d2fa3155bec1a47745d3. 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/USOT10402147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa44422fb93b87116b7670507fb59399e20ed1476816c4b5e43be94eaca529ce. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:08:08Z), 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/USOT10402166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd98053978b12f036300e64213503dc452015c3f0a8290ae8882aa46582542b1. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USOT10402240.