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 0xa42e78ba021b673c1df2d8d822ea12bfaf9ffcc1dc3832193049f67313c9a18b. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8389d49-8d9e-4200-80eb-d55083c3091a.json and https://artists.proofprofile.net/proofs/artist/f8389d49-8d9e-4200-80eb-d55083c3091a.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 0xe77785a2be9ab2987f6a5974b81ccf2d948d98b561f402211b29d00cc312fe9f. 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/DEG932104926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdb43281ded7ab0ae53527aeb769b6123b83dc8daa12f67007f5d071e05f52c. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBEQT2300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3d1483e97e2bb8247ce7d7bc438054146b6de590c3e15500fbd70f053302c0. 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/GBEQT2300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd312ae1e8cb5a5d6f167851d5c37323a3610da4f20fedcbb4f2e4e961d3831d6. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBEQT2300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a3c05df7294c5978aceae624d7714f99ff4382d006eee4d069644fe538b68f. 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/GBEQT2300257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1bacd2a63a538f7116c686b534a849582b18211f8f5e00f9666239f308faf7. 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/GBEQT2300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67932cc6086b06e38636f801091fc31600536bafa11c3be586cdaa4cf1188ca4. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBEQT2300259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd312ae1e8cb5a5d6f167851d5c37323a3610da4f20fedcbb4f2e4e961d3831d6. 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/GBEQT2300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdb43281ded7ab0ae53527aeb769b6123b83dc8daa12f67007f5d071e05f52c. 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/GBEQT2300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804e32ebb6ef3b624f41acf6461c09122d6ff40c658baa04a090486b309d429f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEG932001341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb96bef7971d6f9968d2b86d9cf09662fc12efcc519163f3ea050a721bb2919. 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/DEG932001338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecdcfd23783b137c705d1f1b028f5d944cc4397c1c2948d066e972365300d64. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEG932001339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a66b67c7b064e2266832f862ab3feac7d7836d8e80547634d61f0890d01b098. 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/DEG932001336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6015a4b32e270ceee11ad292cd13df8b2b3d2f50099206baf922a9e44bb1cb52. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEG932202299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd791b8060c3d0304ee45313704c8e25ea308874c6c1f123d8d01852c19ea4a1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEG932202301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b110b0b8d4a0ac81d4f3cf87b3a88daab99b1e94fa53631c6b6bbc937d7353. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DEG932202302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab535aa4fe362b7065c9dd2d8fd731ba87c242dc671bd4ac0b5dd761761c3df5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEG932202303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf0f4b9cc30e4b39443b88d2dbb4fbd0dbb341dd49195ad16a511e1b9e9a5f2. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEG932202304.