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 0xa7c124d02a513453b24862a1074cfea639288f6d960ee314c56b9c986811fe51. 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/4287ef2b-1d43-4fc5-bb4c-a367427963b2.json and https://artists.proofprofile.net/proofs/artist/4287ef2b-1d43-4fc5-bb4c-a367427963b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x353e524907050a2c7447b3b9c7a62931c59c9ba387f50181fcfe44219a759c4a. 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/US5UL1310016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f898faab8881ab2bb496fffa1a9e92019dbe5982c518e99a3e2dff284c2afb. 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/US5UL1145959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475f77753e98e690017b27160db8104981423b50fb6d96182e6145c13ca56e61. 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/US5UL1442781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5e984f7ff84f218f19017006d3fd8d36e1cc9f285d7bae10aa4229380fb74d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US5UL1116843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff82d9136f66cd2008125ba1297cebb9a76be7f06c22b871a208ff1d5851882. 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/US5UL0703089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb6a8701199d95840531e4c5232ee9c2a3ebf65c418d0606cdd33dceb0c0744. 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/US5UL1216586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034eea2442640039e735282ad6b2bce9e277aff28b7d70136ad38dbfa7690efc. 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/USY2F1200905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a8b3f503fbf50670c701e4258505fd4cdbe4f432be0abc6ecad15b60af15cc. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US5UL0920404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c25914a32549ddb23582cb3b82f2eba070c5f2fa5d4a66b5fade15f41bcacd7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US5UL1131949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7679b5ef50c4b06399e59267ab1df6f9c5a262aad8561f12932a2b3b5a0a8a. 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/US5UL1307085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d7e126042ddcfff8719fec49c2db3028e1afd1843f130ba874676e41652877. 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/US5UL1245972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876d862b78317b3387a0c72e12173fdf35e1cb6e9893b286c47b51975452b84d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US5UL0739624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c66afb54832245c63d67062e5f108ae96745338384e8f3266ca821e27b7841. 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/US5UL0668772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6bb2d72eea73630f3b052f44bc495213163cfb516870b4b895befb54144394. 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/US5UL1128699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fa9e334556e67ebc69a35269a9aad84919644f84e98a8fc9c02eb52c1fad86. 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/US5UL1440582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39375b0a6c75db6c613601962a67646decc16ad7d757b2d2fe7726fdb86d70e. 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/US5UL1435131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51080debb33bc92b82d61db1a4b39434db07128723ff310507d291c37fe24792. 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/US5UL1346125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d492b16c5ea1b605083694069b192b45de6a0bd520df1d1e9a3585dfb40bd1. 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/US5UL0722890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d7084bcb7f200729be3709ddd1b3cce9d79ab2bfe0822b876c56182994cc4c. 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/US5UL1205841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4dab9124c6a77e1af63cd604f19da44acd1187959ea54ff26118483aa4014f. 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/US5UL1502371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e2ab1fa4244e10212ba85e84f752ee4520bee76b9ac57058efe6919d39ac38. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/US5UL0708885.