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 0x6acda2fab97f45f4ab221b10c201097852bc08e2be3bcd8e06cb0f5c8359ea0e. Chain 2 (Bitcoin): anchored in block 953618 (2026-06-14T09:16:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c0d3483-87d6-4f6f-b070-4adb95c3cd42.json and https://artists.proofprofile.net/proofs/artist/1c0d3483-87d6-4f6f-b070-4adb95c3cd42.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 0x40c1a4be78772e48728d2e7e435af0602278b98ece9bd26b3983bc55bb4d6586. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QMGVJ1600111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b7e0e4375edee163b083cf7d63572d31fd76f3c0f8b7c7d2361c73d4e5b2d9. 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/QMGVJ1600112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d72158387bff4688f543ccced1c246ed5c51a3cfe1568be6802b816ca4fc46. 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/QMGVJ1600113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519f53389e264042154dba1149b61d726ea8fa2a09c7c70ed2f1c00a182782e5. 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/QMGVJ1600114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0e9f7351d0bd759434d47ecc2a4561c0c0290c869172d528e8bd477431d53b. 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/QMGVJ1700211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae076411e09e95f6362de735c33fafef49dba45786e2bd72bef335bfc4e0763a. 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/QMGVJ1600115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c0016ccf1fba7940422277d9b2b74e9f0ef2ca8494db455d99bdb5dcaf671e. 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/QMGVJ1600116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ca2efe68cf5bf924ce1f3c4b52c380de08f6956007b3450a7388f15068bcbf. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMGVJ1600117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6270016ed37dbed00dd9c11f7934b7fe729b962d80735fd70bbea5488d7a470. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMGVJ1600118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb05b72e0f8852bf8cab2517e7d1282f8921f18ed404da93598722ff1cdce18a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QMGVJ1600119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79424be605a1bdf93dc9cc9fd004e2ab7923c45511d856786a7d6d9c431adc87. 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/QMGVJ1600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9a764e0bca34c6c9e008c2350f794a299762b1c1ad848ab07c85c5941333c2. 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/QMGVJ1600121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cb0ccb159050ce67ae4b1fce3676082bada45d78eeb9d601a021fa3c960d67. 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/QMGVJ2400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aae28d6e3f31ad3da877cbb9281890fd2bfbb19cf4740981e718b0b9e820ffe. 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/QMGVJ2400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b72cbdc9bd3f7df7e3e9d3deb691ded1d228b80ee32a96ced084f7f0efb9496. 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/QMGVJ2400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0449cc51513dab40ce8ee66525472ab55a83ff30e28d2c15f165542a724938. 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/QMGVJ2400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ad992bb153139c960849b85f03faa03f3a09b71bf92b9c8606bcc2c48f5eb8. 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/QMGVJ2400127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0449cc51513dab40ce8ee66525472ab55a83ff30e28d2c15f165542a724938. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QMGVJ2400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aae28d6e3f31ad3da877cbb9281890fd2bfbb19cf4740981e718b0b9e820ffe. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QMGVJ2400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08cb0ccb159050ce67ae4b1fce3676082bada45d78eeb9d601a021fa3c960d67. 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/QMGVJ2400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2474c7a7c0e050df3ca9a84fc1a175a420f9ce84b2f448412305ac7915f4b67f. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QMGVJ1800089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3914946d235168018fdd61f6ae9195a60050acf5307df113ce476634ed9275f6. 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/QMGVJ1900112.