Appa or APPA may refer to: Organizations American Psychopathological Association, a scientific professional organization American Philosophical Practitioners Association, a non-profit educational o
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 0xae60a8acaf8678fdeb177200437947f52cbe8a9c3f145f50a3ffcaee2a36cba4. 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/29787108-2010-45b5-836e-2cea817f5b26.json and https://artists.proofprofile.net/proofs/artist/29787108-2010-45b5-836e-2cea817f5b26.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 0x544177393d43ba4285fd905d014fa3b8ae8e90d1283e248d9d27630c4becfbcb. 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/NLG661300302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101559baeeffdb9dfd7317de2d19d4f1028f99edeab2cbe3d54cdf560f45ed44. 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/NLG661300306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6e1d8e6e0e2befac5a381a6561e6ad7ecc2e765fe42c9e785bb978f284a7ad. 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/NLG661300308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce4428b29901ab1a0fcf6b393bf344420846abab5420be00697c4ff727015d2. 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/NLG661300309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5ddfbf21bb183c95e4fbff69ccd7048b2d5dfd763fd61b409dab9c65bc6ac2. 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/NLG661300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc36197edaef0e028f68c2f31cddb8a2cfb9875cbd2ef0c7857ab5383bc04089. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/NLG661300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544177393d43ba4285fd905d014fa3b8ae8e90d1283e248d9d27630c4becfbcb. 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/NLG661300302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf7bdf19579635660856a5352b24d56118b8fb12107caea4dda332503655a9e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLG661300312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8101cd1c4f4d30d679432f0563fbd7ff5edbcfa7c38d6096a3a8e54e7864817. 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/NLG661300313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9995fb2d2548d6ed4f406af5281eb99795688bf0c76b3e2add1758ed8057418b. 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/NLG661300314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8a13b3845ef5cf6814636c36be49563a1cf4a3b652dc0ce267c856bbe72a11. 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/NLG661300315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5338be0c8c58600a86ceda04b270ee6ad848bc6fdf21392c9241d4d428451ea7. 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/NLG661300316.
#StilleWateren (Soundtrack Van Infiltrant)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c4c2042cf5c8a234146cd81889a86cb34ac6f417e7af02dc88ec015493242. 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/NLZ9L1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c4c2042cf5c8a234146cd81889a86cb34ac6f417e7af02dc88ec015493242. 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/NLZ9L1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a29122bf5fa6ba9d9567f6ede3a8f02799bcfbea27a3285e6d619fc9604c0bc. 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/NLG661300344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52dd13b6eb891291082cffdb732cefeedd7d3b583be960b80c23d9da07f711b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG661100286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6a3c094d4e166ed505b87143f2997e77c3d91ddb82a4687459ea80b649398c. 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/FRUM71600561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27defaa97745d37b3a2fd6b53f79884a4c729d56aefc75f63f9422d6d2804e43. 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/TCADD1780044.