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 0xd7e4450b87928eadbc9e49e9b52ffe78b912d1ed33ec0939087627f57715e8a4. 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/2b716aaa-4d71-4cde-a03c-e99f2103e990.json and https://artists.proofprofile.net/proofs/artist/2b716aaa-4d71-4cde-a03c-e99f2103e990.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 0x7a3b90fdf4ba51e09136624085f5bd88e28160b9bda1c79b21927d566e63652a. 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/USA2P2419021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607e50ee5cfb8366f9e864c5cb2ccfd1c6a7cee0230a95430196a9bb03a189f3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2435900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1063d67560e777749947b91e0b09e84445ed0184410be6ee3a141e5308a81a8f. 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/US43C1631040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376e6b14b75063f273cc9e34c90dc186eb434a63aca9adfbc60aedf358eb0539. 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/US43C1630516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3af0a604aac14842c9b507ade2c139190cf9fb8d066ee65d32e5475c22ad00e. 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/US43C1631882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e24f7657506fe0a237116d81485c65580cf110b043ab70751017953762c4a71. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2435901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3af0a604aac14842c9b507ade2c139190cf9fb8d066ee65d32e5475c22ad00e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1631882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a8259b23224f36f1d57664023ad41c664ec16d97cf36ed70d4633603162f74. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2363067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376e6b14b75063f273cc9e34c90dc186eb434a63aca9adfbc60aedf358eb0539. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US43C1630516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13d239d8112d898ef4335467c46386f400c36d17c08c1d7514b3e55744d33ce. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBWUL2342243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82827803fdda3c7815f4a99ac132bc74f6d828d5065cfa47bbd2294fbff176ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2374297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a83a2f0cd50d4fd90584388a49cfbbef8a0d70bc0d471725cddb0bc85d1b2d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5FN2363627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2122901375adfd4cb90f656a5444f6861517efc0c7e51686e25f2476d989c7. 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/QZWDD2231323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93693eeb712dcddf4f5109fd6b0add31c9eb525f2720aca3ef411d1923690fac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAGD2206087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f716b321676060878afe832cf6309bcb42f87b22822b165444a9e645bd4e99. 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/QMRSZ2101042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fab927be2072118be63b64a5a413944053c2691a7828d48d11ba31260f8b158. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFJ2143061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34694088125c9c58aeb68738e187a16ea559e9f4b22b5bffe6829a3f78011603. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFG2092492.
Indie/Pop/Folk Compilation - November 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5372a4860f77832de89de12217a7abe6e239c8f78141ba4346191762c2df2a8. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:27:48Z), 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/QZMER2209163.
Best Indie Folk of 2023, Vol. 1 (Indie Folk Central)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a83a2f0cd50d4fd90584388a49cfbbef8a0d70bc0d471725cddb0bc85d1b2d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5FN2363627.
New Indie Folk; October 2022 (Indie Folk Central)