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 0x784a357aefb5ce081202a1260cd07e0e256891cfcd4681a40bd52bb14d16e7e1. 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/0da25949-610c-4d85-8d43-0064d796e342.json and https://artists.proofprofile.net/proofs/artist/0da25949-610c-4d85-8d43-0064d796e342.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 0x0805cd90f9b275f9c8b49a9247cc987acfa77ac6fd23ccfa87dcd574201d97d5. 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/BRRPL1400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520df2c30ea50db2420ccb1f48c7c97440721a717be0f264d3598f8fbda055b5. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BRRPL1400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d437b0aa6dbfd5e01322c87c0f8e71a30604e07cf3ee73cb47a660f71be2df. 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/BXRHI1800109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7a9ef06074d1331a079f07846f67ef106b0d5d53c18dd757392461646461ca. 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/BXRHI1800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52a1d6b59d26c8a85505933aa50d2c0a45ae406189c07f3eed27d3a59f78759. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/BXRHI1800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c65f3e516288e272f9d2de622874b6500d61be87c1a48004d83aaeaf0829742. 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/BXRHI1800113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc5b202d504a4a68d5bda521378ca7bca376931199a51ee4ddc2eb26f9b4ee0. 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/BXRHI1800115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2b6d45b36560e0ff846df96a1f29323609ec6db48e7180ff39f1df61addb28. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BXRHI1800116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf872c12679d059c7fccd033665ff778a55dd907423edfe19ed08436b1f82723d. 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/BXRHI1800118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c00b625661e3a6b03423fbf160cbec9061b7abacf8e32aa3f8a23566003ddff. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BXRHI1800119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626cbb8f17563c9fb65cc53741ee36f1e40329181224c11468973c764271f457. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/BRPUI2100571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af2faa5ba88d4c0c38319d9c3c3480dc6ec833e90ecf3fc2fcf4705ee6e959b. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/BK6T62400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140eaf8eb3c3c8234ae82e2754e0a2c2abe86c93962f29de3f87ef948f9ddb7d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/BK6T62400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa008ab091af0f20c63442252072ac5c162a9203a6d08a3062d618a36622b7030. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/BK6T62400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40636f989f8c3fc50cfc670db47d8533c78df1b0c98a3400d97909a051da1c61. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/BK6T62400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7dab220706e72eaf8d8a9b1ff902f1df1e9c87dd12139fdf3493ad4b75dd86. 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/BXSVC2200183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907da71c083b66edadc7f5798882fdd9f08b4ab4782f6bdb9ae30c93b1af31c2. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BRPUI2300139.