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 0x9707acd99c68d3864aacd9f0a2a61b0d90c39d398d827426f81a3b7adf807186. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3de5b38-ec79-489a-bfa6-34b614e9f97f.json and https://artists.proofprofile.net/proofs/artist/b3de5b38-ec79-489a-bfa6-34b614e9f97f.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 0x1bb6b89ebb6e2a75b746e565b3bbb3d55b98866fdef5574768746ab1a49e15d4. 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/QZDA82067567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779ab83ad58ae5e85f7fb59c10fe214c780e52fe684d416a2d033cb7db290071. 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/UST8K1772303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee7f542085d787bc44e57bfc1807ff627659fe1b705fa00948e0672c73fb2e7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/UST8K1772304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8224bfb01d07cb436ddd14a90f9f6bcc9d7f8d99eeb00944f7efe1a0a1b862c4. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/UST8K1772305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcd60eb7bb34fe739f2dd0785e741d7e6ad3d7eb7babce8004bffe48835b1b6. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/UST8K1772311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20c5be6b8a7977c0bf43cf2983df3d66915e9171ae9108639b140545d9a0e7d. 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/QZ4JJ1604757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbccbee0c8d2491a0143a69f605c09cdba37ab836ca0f2d081d8d5168a09302. 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/QZ4JJ1604758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8bbd3f58d992c09bbe5ead328607aa9c71f07ab5380ea09389bed371f47252. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZ4JJ1604759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22f60a2298384e4a060c5a55dc856ee99dfa3adb9f3fba2c7aa9e55f65e56b0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZ4JJ1604760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe4ad698d53374f8d2441320516ab08568742ee50dcce0c93c6584c6f1a56d0. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZ4JJ1604761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed51fc4b71437665ee66fec1a26976f05ecb2af03f9514999b3282a37f913c4. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZ4JJ1604762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b81bd9ea102f07312d5549a54bc633315733f83440979f4df90441342e22bbc. 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/QZ4JJ1604764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270eedc09ad0a355edfedbfa7ec0d3a9cac7acd061ec232be24b3624a37b7287. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZ4JJ1604793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d261e2f9119192987bab96f00399f74313dba74bc9fdd39e7986f14ec698b5. 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/QZ4JJ1604794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd075389cbebf8ee71e7b49302b91a4cd8016a42dedbf2bcfb11d5714d054ad14. 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/QZ4JJ1604795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0280d64ee6eedbfabd9752c6643ec8155ad0c15b45b4812d5808e1e1e22bb2fe. 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/QZ4JJ1604796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbccc366152abebc095bb0b7b1ddbd763bc8c549a5a16dd51c91e33ca5aa379c. 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/QZCE61849073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c53ae1e37d08ddc566f3916e008346c31d20674cc5d2cb16280cb701bf1848a. 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/QZCE61849075.