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 0x83eaa266d7119863dee8db9412fe0ac3af16f4ff05edfe39f8ece3812abd4275. 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/a2e01ef6-a703-4a63-a0d6-3d077bd6e273.json and https://artists.proofprofile.net/proofs/artist/a2e01ef6-a703-4a63-a0d6-3d077bd6e273.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 0xb294ce8d721f4e6c128ef1b104162b5ce8e7d417e129c28a800e381d1604736d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CBE7E2400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3228bc3ff9630bf9a284e1665e46e8400240757f44af80ed5f2adbe6df60ec8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/CBE7E2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9388519f0aa65c5d33acd96590f169ebea862ef852ee0eee68f108ced6c9b290. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CBE7E2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5aa4ee596a216a7ffb411ac776692fa32fdeb8f2306b2e7e70c5b4fdb96f1ac. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CBE7E2400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430dd5c623bd34a12e0e70846a5c4095d7003f079a870c98c184bd9ae34e2cf9. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/CBE7E2400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe593b3b90b5dcc9521bfd9141c5a6d3d8993c8c14e400fc13771d96f2f259aa5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CBE7E2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6589f81851d39328b2459e402b28ca5acd890f43e78e34354c8fdeb684570d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CBE7E2400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5276bca52ee03fb9cb96a18f4203098d0a26ac0d297d9de69aa69379e5579aa0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CBE7E2400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c5bd8f8eacb5f42fff0d4d848a9c89a420721b6110916775f3f364f3e4acdb. 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/CBE7E2400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f6d4ab85624ce37b958afc12ae1fc6f07dbee90f4683e691e379bc10c4beb6. 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/CBE7E2400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa758eaec2466f9809f54cf2fb07eb430200acaa17f299698930a2dccec7bcbf9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/CBE7E2400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890868df19a1ad04229c546ec997a503a3ae1e2ade0111ba1e692c77a89994b8. 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/CBE7E2400063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462be15e3224e1b3ca5c14f5fc058c2fdfa0a330aea10d296becfbb4651db6c6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CBE7E2400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c755e7a418bed73b1952736b795b2309ef03828d6ff57dad5ac39898fe8c3f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CBE7E2400065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cc9fc73903c62e398fb85ec08fb9a5382591dbf1640f8c4cbc8caea2d667ce. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/CBE7E2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd82c4ed21bdabf8d52cfe800b9018c4a954b46a813ae293915b22992c55d9b. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/CBE7E2400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf135bdfbfe7223f8fe69dc0a582c1bbca5e7155b84275cc8275e232158c77e71. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CBE7E2400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bf5d7a00e638c39d24bda44e5fd32e61bf4b7dcf402517fa39db60520d3783. 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/CBE7E2400069.