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 0x60558e4c1ce82260ff5f037ae0fa2620b441d8b929c38929b1e62e732f4292d5. 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/161c2fbd-160a-4ff6-9523-02b5d9f27654.json and https://artists.proofprofile.net/proofs/artist/161c2fbd-160a-4ff6-9523-02b5d9f27654.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 0xa8ddc1d67f4a58497d0bb24ad0fbd3902286844e9ba5a677712e212e178d0903. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/UKP3G2001963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4bad1a17e0a8fc7e16d287662edf9e10416a6ad9ef900e68452376d0d212ce. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/UKP3G2001934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ddc1d67f4a58497d0bb24ad0fbd3902286844e9ba5a677712e212e178d0903. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKP3G2001963.
Baa Baa Black Sheep and more Animal Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d9931b43e772004df713bfab15d718d90dc8535e4d699e2d7156017555c6f3. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/UKP3G2008833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf6277c2266830a618ebc94890a89c47259991da98b20badda41896325baddc. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/UKP3G2008836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbb6ba893b924315b08a36e2b6993dfbca4760473d68c9f2cace9a200d840f7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKP3G2009243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de3793fcd75a7346aab5490a9c0231c8f42dca2896bed7bf9ffb6183b97a4a3. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/UKP3G2009244.
Three Billy Goats Gruff and More Animal Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9baf59d95f9854c010f96f344b5d494d7598325d77a1d03df458dd964627bd. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/UKP3G2009295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a44c7660a0242e1e3a3ca7c09470397c5609d83d622aa2c0d514f50ad2d800. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/UKP3G2009406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa51b040dff0f4742aa01f5bc05a516ac0e63523f7acffc06c9e3f00ad8df4a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKP3G2009407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50e9a137580229f1ae226487a11c91a2cdceef97f0874d4653775a7b5d2d23e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UKP3G2001919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a44c7660a0242e1e3a3ca7c09470397c5609d83d622aa2c0d514f50ad2d800. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/UKP3G2009406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa51b040dff0f4742aa01f5bc05a516ac0e63523f7acffc06c9e3f00ad8df4a. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/UKP3G2009407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23dd4a3d1153349c4ad9b7ec362449225832880be39fb9459916982716ec45d. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/UKP3G2301449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d3155d2ef6070aa892ab149a874a2c39078a8a9746983a6e676453ccb1b8ab. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKP3G2301454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52572f4bfc11d52a56ab84663816c910669196c65fcfd8bdded605e1c99aea82. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/UKP3G2009995.
Wheels on the Garbage Truck and More Kids Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f8f3b76f3584175fddea0a046ea00bfd56e698b73b2c0e602e8a8317658599. 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/UKP3G2001954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b108a788bb32ae9d4c27c5586c5669854ee48a5f03b8720f806ee1958d36e7c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UKP3G2001944.