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 0x3b492c369551fcf48272981b1a62c7695451eff3e4e34a5f82fecbef10a98ff1. 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/1428e917-f30a-4794-ab64-2485f4fbb6ae.json and https://artists.proofprofile.net/proofs/artist/1428e917-f30a-4794-ab64-2485f4fbb6ae.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 0x65ff5f7fe3f370781ec18219a9db8b002c5cb63a5bf1c41247ac01145858ab51. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKQU2012765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f05583c4490a7aca53ee1658b7459d84a3da5ddf24165c8995faaa71e7a02a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU2012766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c66a79684b094b8994390d887ffc10ad7aff166908edc813fcd957c0af1079f. 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/CA5KR2154309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9caa7d61db7a5ce39d625e03bc271f230b3b1b9111d0503d20b48876b484d95. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CA5KR2154310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7ef6049d2be160ed6a1f36e0106d6d0865e052f3252ec73698c8628ed04b06. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CA5KR2154313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8117a74e72f8c9f44baf78d3d536770186d17e43c978e7623e8205fadd8106da. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/GBJX32155027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467b820496032b2b134c11122540e4e25a33f112c6613251f98f3931b3afcde6. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/GBJX32155028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd054af9ac23bef680a57bc3e4bf0a6609400f27b8f506cc8cf129da5955a518d. 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/CH6542337141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cbf82c2cd3ea1286212f1d358a0d0194c9d7057e7c7159790f737ff5a94e5e. 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/USNRS2443269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ba3f0409a981fa49e3910cf0125241f396f6d767a77a0c9a6905a8bab2f913. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USNRS2443270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa469f8901c243fe0983fc7e5c984b1577b01a2af8e6e7d685599e1c14877b60e. 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/USNRS2443271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eb26fd8700b8c27cb554a6da3b300615b0bbb42c2afa4107cc411553093ff9. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/GBKQU2555104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11ca740b4cd211a4953373ed12bc7f2e5ef7373a2da6de7daa526e85acab2a9. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/DEH742408584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbc1fb7b9e06174d3986c7d560bff516dc9689c1c2d3d086128918a02c6c65b. 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/DEH742323935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0cdbaa09df2a4a39cc4752aa25c6a8a409da73f004e98799d41c17193df286. 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/NLHR22200749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe98f1b6e7221d366f4b41320d97d1457d57cb7924552f118f89efe9747be14c. 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/FRX762202999.