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 0x4edc91b2a1b809d31dc02a19d7ede41a16e484631ccf5f85ad1f2da779db8c55. 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/ca8f885f-287a-442a-9d55-93c6c42f6ae9.json and https://artists.proofprofile.net/proofs/artist/ca8f885f-287a-442a-9d55-93c6c42f6ae9.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 0x1718b5e2f1c2087249955369487b15b883269fb72eb8c42554e4c0a9a91824a6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BKF442400287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ce4abf2b635394f7e782ca7c651866434ee4efb32ab59fdb531c32eff99180. 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/BKF442400239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f730e29600e0be51757da90a9a1907066e9f5cbee16c809608db867eb758a5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCE7P2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570d1796ae6c405ae2df504ebf43c20088deb01ae620ebfc53ccaaa7f2fa31c3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BCE7P2401016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c4a1e657e41c3ae1304aa993c41e8b6ea15058e13efc5717a092ab555117b8. 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/BCE7P2401022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a699a4ac557b60bf728548af719eb5273271c9e714e3ac2376d08f3677c7d0a. 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/BXTRN2400686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7600873fa11903f694617cc792881a33f7abab8582d713c5d0f4c5ecc7c36464. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/BXTRN2400685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb056ecd5f6abfdceb0dae95c1a4989aef96c1c43a1cced19feb222a39a839943. 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/BKF442400264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f819d75b0c48b7ffff512ba7a777561d0ff8e8336ad7cf6e691e8c702560fa4. 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/QZFYX2563468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33b180a5127d45ec2b949c5a3fe24c62609845c734f3be3e957cc7b3631b686. 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/BKF442400283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcddafc082fcdb0fa78e9593fb2d2e7501b88fc7d70eff4a1924a6862bdb70ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKF442400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd739bca23a7169a09405df791810c4a62f4e4c040cd635b54b1c34791a73bf37. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNWY2493893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704cd074b4992b07f2c61f70d88af80e508fae35c82187e4117a93ed50771323. 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/QZNWW2467139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3cbe4de08303a3da20f55f292c64d8639528861199cbde9f40d10b6a6b66ff. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GXD7G2437507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed802d35c49682895649b4aced78d9b5046374d5a4342e9bc70d251e1ac94ea7. 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/QZDA62401394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5aa2ed275d9366df9e208d624b042a2949a496011417a737a8f5feae00b3a86. 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/QZFZ22473946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba8d448d20015e43291f2e6f0cc29e34739247ef1dcd57787092ca13edfeaaf. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GXBAV2328026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49199544d1578ae0fa10cd96163b6927ef4b000070bdff8b14da33c54d93d550. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCE7P2400571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07723d35e356ac80916ac2c4b1715dce1042c690b552374f81830baa56c6b3d. 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/BXTRN2300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41b7db40a725eca851ff8f69a4717da8da33b9a747cd966c6df173f1679cc39. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BKF442400069.