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 0x72e542d5126003b5c7c127323ae400026805f34788699041330c3d9d629d585a. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4676f63-7d07-4576-9856-9a55be68933d.json and https://artists.proofprofile.net/proofs/artist/a4676f63-7d07-4576-9856-9a55be68933d.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 0x380613070b754fb01a31b755d2c82c8ca61ec1179549459eeff8bacb5e318b33. 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/TCAIS2436483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb2af091b5954666df1776bbee901af879995e80b0bcda1e234ba4a077bb43e. 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/TCAIN2473526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffb403e209da99f836a3d5eff7e0b3ce95bc31d45fb6454a00c57b6cf5230bd. 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/TCAII2464644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150ea3b8db16e84b34816d944596486ccebc60c43e0f4af163f5cf538e23ac8a. 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/TCAGH2293690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c58932c72cfd41114504e7ef3f257631aa93966e7cc8bc354ac798f4e79609. 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/TCAGE2250272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492670c6079325062fae42c43e39d19ffe8dc899002a98be13931a510d94479e. 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/TCAES2087843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fa01c966e1dae7323a740ca656f55bac3959c604c3c1e686e387f781e1b8c8. 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/QZTAX2404181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f30eda91a734ce3fbd8b8295b5c5af4f87fb06f3c6fb5714dad15a582e99ccf. 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/QZTAX2404182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32495c396c6737a2c93aac5154f18dc0788da60cbce43d6e7b2a35b9a9a7a98. 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/QZTAX2404184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf43f64f6d439de41dfe2ce4b8478e44d4836e8ef161c0e2f376d51bdb9d9924. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTAX2404189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd185011651b09f6fac5fad4b788f031e138c47866c68de3f7730c2e22d73dfab. 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/QZNWS2254800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157eb939baf4283dd0772b981ca30d5caf01c38540ee554953b5f7ba78d74da8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNWS2254801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aec81f438e65451a3df10d4a620d92291b7154e7ae05f77c412d875476109c2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWS2254802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902aac7affad11c0c01a1eae8b9a2e6873a93802ce197aa5993b6cf99ac6208c. 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/QZNWS2254804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaea3425dc4f952314718568e6a7c8bf9911dd20327417d51fff044e5325bc16. 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/QZNWS2254805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b512b3384ee2ac1602074ae3d73790b8bf652924eee2b28acd6c2779406734b. 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/QZNWS2254806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376e18fe9df423ebceedea957491a7b1c3f122d5a31195dd8d6fd8d3f6b40517. 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/TCADW1836513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b7bb7f28f6797c7ce0849492b51695c85cab1c84511fdcad479d0518112e2a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T15:11:03Z), 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/TCADW1836515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986903ae1f37cf5ba3b854449f47f27eb8220181925ce12c7cf9301ef311aec6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCADX1881160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b8718b8614bbe64812e111a70be8383bbe0eccbfcfc198d8d5662636da0908. 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/TCAEH1921602.