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 0xfbdffe313e543033de1e40e6cfeeaabe87526077ff4c271924bcad98c8dc4a9f. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/130b83e4-5f5f-4073-bf2a-40f1d470f3fa.json and https://artists.proofprofile.net/proofs/artist/130b83e4-5f5f-4073-bf2a-40f1d470f3fa.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 0xcb2c8a77f214af52df39bdb568236b15833bb965778f71bc493144c9a1e1cdb0. 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/TWCT52330366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405a5cf8a19039f3cac14c6876bfe3cd2f1154ee489ffd78563623d6e4e06819. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TWCT52330367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff242d933b5a8f525b0889690b686218040460f4238c91a95784f9791790676. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWCT52330368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377c98343c93e9c8418968e14dfbea954003fbee6878d000a19eff0e515cf312. 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/TWCT52330369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf2226a9ae48ebc1b755d4bca63bded502474484f0cc3919f572093a2fa617a. 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/TWCT52330370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5de9be33eebd54238d8e19e3dc114feca7ad1e196ac56d428348061d32ae5ae. 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/TWCT52324988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a5121738c30f393999544c61d1f1ada9b9bd62961e3b8c9b0a235f13b39482. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWCT52330371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36117623d1b01f8939dd4b9b6537b608a80ed07cb1bc9bea4348f4514b95ec36. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWCT52330372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ddc0445527d0b07e1c1ab6c5d53abb21d6da68c40e0a4e26e53e782c0e4d97. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/TWCT52330373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02aea570fdf593d190411269c0dc9cc78ea92cbdb439f4f309f94ca4c445d065. 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/TWCT52330374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b143eb4e39d7b81975401cbce9980632a26bb3917c1a50bcdb32d3c38dc610. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TWCT52433437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6ab77e4269dda9be7d9588998df772c370f4541af4e21d4a55962689b3223d. 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/TWCT52330386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7923bf6d9f23f6590432fb19fc3f5ce04d6f87d67dd13001dd72de567c92bd3d. 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/TWCT52321061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9a132c8b54c153c5eb9efcbdb2a8e56c96c7c218a65c858c05733a4a81438c. 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/TWCT52207786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9975df775ea33006c1c3adb90f9c87383b907ce2754ca45929b7fcc5ce8a8a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TWCT52207784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7601a5e2c18eae9144dc78345513ad0e1d8101bc0c0f22be38594e4c2266ee. 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/TWCT52207785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb4594063de64efed972dad5363b7ab749a936e01138eca18f978bae138e503. 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/TWCT52105531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4342767dc91ffbf43c35b9485ce0efe013cc16e395e4d97a40d04bc04c872876. 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/TWCT52104223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43caaddaaa27c570c9c52759725e42039e71465fe36c4a92bc66eef77d04fc8a. 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/TWCT52003398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d22030778cb9b13d15c4e6e4b874e3b1c6c98d1d4ff5341891b4b6569d49ba. 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/TWCT52003399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1ed03ee9fada73d54287aafa1c2d252250197fef3a1974ec2ec16b6326a2c0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWCT52003400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62641b5dd01f88619ec72d128c65dbd0b07a317df47f04a9ff416053fc2665ab. 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/TWCT52002279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a92999324aa270e0a10ed9719929194b9289bd7c7e3fc7dabb30d4818cedf1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWCT52001492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ace6aff6b1a748cbd28439ec1a9d8d9a93aa8609bcdeaf99fcc44e04c5267f. 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/TWCT51720701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdce0591b13b70590c8fd7fc88c0a183e46d11eebbc9977659d12e9a2e87939. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/HKG732152450.