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 0x833373b871aa3901ce9ac3fe26b86285bbddca06da0ff75e186c6102e9d93ebc. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5bc2e13-ec8f-4f49-8150-f5eb6fae2e2d.json and https://artists.proofprofile.net/proofs/artist/c5bc2e13-ec8f-4f49-8150-f5eb6fae2e2d.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 0x3a171a8e149e0e42dd211c1eed3a61ab6e833aa59b028369e6985c4b09451d1f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/KRF252300576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb013627075e294b67d13f0d7a727ada77666f1f5047a0c9a2bb58f0aa39bf5cf. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/KRF252300577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6a471e6fe43b72e3c70fcb55639667cee3ca40c289bb2b31fec297df613951. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/KRF252300578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb97ae8be46eb64ab5013144c62d5b67e31e971c801c61ebc837f8beb07792cf. 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/KRF252300579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d575f0ad21f0f22a33f9db63890d9a4e34a211cfd696ea1f9f44897c9fcb1cb. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/KRF252300580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502bf06fa16bffd3ea9d071999a342bead8e3d606235675dbd5d8ec6212f4ac4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/KRF252300581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874ae547bd2f45e55aa84838afb96f32ad53a6e5a468a90ad27b73168261deb2. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/KRF252300582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c107c29a4ea0aa7ed0b8f48a9dd29ecbfdeabc629e6a61b18a6838d5873257. 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/KRF252300583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b6c5ba44485922a9b40a0fdf718b5b0ec920172a3456da3fb962a5bc6dfe7c. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/KRF252300584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a38644b4f63450728c4d02ec46585944d4d81117b3cd6a1fc64127a315e0bc. 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/KRF252300585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f15b12bb58a7c6e33cd6d38a3964b7e8006951956a905e754dc41a84c6feceb. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/KRF252300586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5999f359fd3b0dd1091fb7cc3eaea4fe94682a63fb44cafe8de430d273173414. 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/KRF252300587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa712a641f5ffc2e06af3166cedd2be6fb9aef47882ba67c41baa2331a67ba15d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/KRF252300588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2f502a59f1d90c8e7f8a6dfbc9bd1c87b0ff67f179077ce1dc9fc09a55bebc. 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/KRF252300589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb312bcaee55cc73f00bbc52d286d8c0e802d5e9b5b0c3e655ecb3fd8dd023d3. 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/KRF252300590.