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 0x5873152ad776e6df0b47cdb52a3235967e4b1a4c8192ce1fd720bdef65c25825. 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/a50d299e-b3c3-4cad-89e0-c79f93f07caa.json and https://artists.proofprofile.net/proofs/artist/a50d299e-b3c3-4cad-89e0-c79f93f07caa.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 0x792210548da12a1c55bed178d637c83f40d8a2b42aee30715f3029fe3e8a82b1. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FR59R2113041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502839243fb2e3a74a5d9b1387c940f59f9dd27013689eabbe8fe36ed6bd38c0. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DGA0R2330685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2405117e45719845b9ea03fa46e65dbccc4796e08cb224897ce95a74a352454. 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/DGA0R2332128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0ea9de9b7a01c20af34cdc4247e48b4670599655a84776b6725b2a81e7e73d. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DGA0R2329680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2efdf054f336cca9a57e9147d8b40894846c703c7b9c9a9fadbd3e7e91901f5. 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/DGA0R2331062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a76251295371404c86dafa114f82c43436df6e44063c4776272f009ec231744. 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/DGA0R2332127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db5b28285703de5f87bf9fac66c6855e88115b61e9c0a409e6feccb542a297e. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/DGA0R2330106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dedd23fe3ef8ba96b3f77599e55e6765357b3c770f88be138aa03d90e02b5b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRX202151576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb094474bd29bb781e983a2e24a0254c208b8087e31b3de39fdedbcf33e28c1df. 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/FRX282192332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8edb3053697f259ee847d6a86036b48ad2c8a1c9071f454aab86af2f2d91524. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRX452142196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fd6d0f445243cf19ce1dbacc0720652bf2e2eca9c1f9dd81bf7e02f7f263ec. 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/FRX762149406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998f256a3510395de15ac36348d9c0197fcfc8186e531d39feb9bcaa57546b61. 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/FRX762149405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c51e4b7ad67ed12abf3eb24cbc03fce1e930cde21074259ef711b68c4a8358. 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/FRX762193064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31f19676cc95f418c45e780c547da944aef4ff3f3885d80ac3b7f6edac2c9c9. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/FRX282207329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2b4398e8fe8deee818c50eec3d8132b1c7b3bdab2c25d67d34ac85bab477b8. 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/FRX282221200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc9bc56837b7143a334f5b893f4fa54192a03c79c69ed3f59ca09ae6db7d730. 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/FRX282283339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43d31fe497439f37111ea1149804143386fbb715286ae5b09aa7a0e32ec9cd9. 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/FRX282283340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ea231091762a476d367126bb80e0079dcb461616c09b4854379f4eeaf5f886. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRX282295070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555be014020b413a6a5a46a73deb46cba0c7fd57aaa67e6cea25b1bda2ea8d04. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRX282295154.